Optics — practice questions
129 curated practice questions from Optics (Physics JEE Advanced, NTA Exams) — 127 hard, 2 medium. Every question includes the final answer free; step-by-step worked solutions with a free account.
- In Young’s double slit experiment, the phase difference between the light waves reaching third bright fringe from the…
- A monochromatic beam of light is used for the formation of fringes on the screen by illuminating the two slits in the…
- A monochromatic beam of light falls on YDSE apparatus at some angle (say θ) as shown in figure. A thin sheet of glass…
- Young’s double slit experiment is made in a liquid. The 10 th bright fringe in liquid lies, where 6th dark fringes lies…
- Assertion: In Young’s double slit experiment ratio I_ max I_ mb is infinite. Reason: If width of any one of the slits…
- Wave property of electrons implies that they will show diffraction effects. Davisson and Germer demonstrated this by…
- An optical fibre consists of core of µ 1 surrounded by a cladding of µ 2 1 . A beam of light enters from air at an…
- A concave mirror is placed at the bottom of an empty tank with face upwards and axis vertical. When sunlight falls…
- Angle of glass prism is 60° and refractive index of the material of the prism is 1.414, then what will be the angle of…
- A prism having an apex angle 4 o and refraction index 1.5 is located in front of a vertical plane mirror as shown in…
- The angle of incidence at which reflected light is totally polarized for reflection from air to glass (refraction index…
- A ray of light travels from an optically denser to rarer medium. The critical angle for the two media is C. The maximum…
- Assertion: In Young’s double-slit experiment, if intensity of each source is I0, then minimum and maximum intensity is…
- Assertion: In diffraction phenomenon different maxima’s have different intensities. Reason: In interference different…
- According to Huygens’s wave theory, point on any wave front may be regarded as
- Statement-1 : There exist two angles of incidence for the same magnitude of deviation (except minimum deviation) by a…
- In Young’s double slit experiment the y-coordinates of central maxima and 10th maxima are 2 cm and 5 cm respectively…
- Statement-1 : For observing traffic at over back, we prefer to use a convex mirror. Statement-2 : A convex mirror has a…
- A rod of glass (µ = 1.5) and of square cross section is bent into the shape shown in the figure. A parallel beam of…
- In figure, a wavefront AB moving in air is incident on a plane glass surface xy. Its position CD after refraction…
- Statement–1 : A virtual image can be photographed. Statement–2 : Only real objects are photographed.
- A point object is moving on the principal axis of a concave mirror of focal length 24 cm towards the mirror. When it is…
- Assertion: Interference pattern is made by using blue light instead of red light, the fringes becomes narrower. Reason…
- Statement–1 : All large telescopes use parabolic mirrors rather than spherical mirrors. Statement–2 : A parabolic…
- Two point light sources are 24 cm apart. Where should a convex lens of focal length 9 cm be put in between them from…
- Angle of a prism is 30° and its refractive index is 2 and one of the surface is silvered. At what angle of incidence, a…
- The figure below shows a double slit experiment. P and Q are the slits. The path lengths PX and QX are nλ and (n + 2)λ…
- In Young’s double slit experiment how many maxima’s can be obtained on a screen (including the central maximum) on both…
- A parallel beam of monochromatic light is used in a Young’s double slit experiment. The slits are separated by a…
- The figure shows a surface XY separating two transparent media, medium–1 and medium–2 . The lines ab and cd represent…
- What will be the focal length if its curved surface is mirrored?
- Assertion: While calculating intensities in interference pattern, we can add the intensities of the individual waves…
- Statement-1 : The images formed by total internal reflections are much brighter than those formed by mirrors of lenses…
- It was observed that when the distance between an object and a lens decreases, the size of the image increases. What is…
- A small piece of wire bent into an L shape with upright and horizontal portions of equal lengths, is placed with the…
- If an object moves towards a plane mirror with a speed V at an angle θ to the perpendicular to the plane of the mirror…
- An air bubble in sphere having 4 cm diameter appears 1 cm from surface nearest to eye when looked along diameter. If a…
- An under water swimmer is at a depth of 12 m below the surface of water. A bird is at a height of 18 m from the surface…
- A glass hemisphere of radius 0.04 m and R.I. of the material 1.6 is placed centrally over a cross mark on a paper (i)…
- In the Young’s double slit experiment, the ratio of intensities of bright and dark fringes is 9. This means that
- Assertion: Thin films such as soap bubble or a thin layer of oil on water show beautiful colours when illuminated by…
- A rectangular block of glass is placed on a printed page lying on a horizontal surface. Then the minimum value of…
- Assertion: In calculating the disturbance produced by a pair of superimposed incoherent wave trains, you can add their…
- Assertion: In Young’s experiment, for two coherent source, the resultant intensity is given by I=4 I_ 0 ^ 2 2 . Reason…
- In Young’s double slit experiment, white light is used. The separation between the slits is b. the screen is at a…
- A beam with wavelength λ falls on a stack of partially reflecting planes with separation d. The angle θ that the beam…
- The refracting angle of prism is A and refractive index of material of prism is cot A/2 . The angle of minimum…
- A concave lens of glass, refractive index 1.5, has both surfaces of same radius of curvature R. On immersion in a…
- The relation between n 1 and n 2 , if behaviour of light rays is as shown in figure is
- In a Young’s double slit experiment, the slits are 2 mm apart and are illuminated with a mixture of two wavelength _ 0…
- A water pond appears to be 2.7 in deep. If the refractive index of water is 4/3, find the actual depth of the pond.
- Statement-1 : Although the surface of goggle lenses are curved, it does not have any power. Statement-2 : In case of…
- Four light waves are represented by (i) y=a_ 1 t (ii) y=a_ 2 ( t+ ) (iii) y=a_ 1 2 t (iv) y=a_ 2 2( t+ ) Interference…
- A fish rising vertically up towards the surface of water with speed 3 ms –1 observes a bird diving vertically down…
- Assertion: When a light wave travels from a rarer to a denser medium, it loses speed. The reduction in speed imply a…
- Statement–1 : If both plane mirror and object are moved through a distance x, then the image moves through a distance…
- If the central portion of a convex lens is wrapped in black paper as shown in the figure
- Assertion: Two coherent sources transmit waves of equal intensity I0. Resultant intensity at a point where path…
- Assertion: Corpuscular theory fails in explaining the velocities of light in air and water. Reason: According to…
- In the figure shown, of Young’s double slit experiment. Q is the position of the first bright fringe on the right side…
- In a Young’s double-slit experiment the fringe width is 0.2mm. If the wavelength of light used is increased by 10% and…
- A hollow double concave lens is made of very thin transparent material. It can be filled with air or either of two…
- The image of point P when viewed from top of the slabs will be
- The minimum distance between the object and its real image for concave mirror is
- A convex lens is used to produce a real image of the object shown in the following figure Then the real inverted image…
- In a double slit arrangement fringes are produced using light of wavelength 4800 Å. One slit is covered by a thin plate…
- There is an equiconvex glass lens with radius of each face as R and a µ g = 3/2 and a µ w = 4/3 . If there is water in…
- In an interference experiment the ratio of amplitudes of coherent waves is 3:1. The ratio of maximum and minimum…
- When light from two sources (say slits S1 and S2) interfere, they from alternate dark and bright fringes. Bright…
- Assertion: No interference pattern is detected when two coherent sources are infinitely close to each other. Reason…
- When a thin transparent plate of thickness t and refractive index μ is placed in the path of one of the two interfering…
- Assertion: Young’s experiment, the fringe width for dark fringes is same as that of the bright fringes. Reason: In…
- Light is incident normally on a diffraction grating through which the first order diffraction is seen at 32°. The…
- Find the thickness of a plate which will produce a change in optical path equal to half the wavelength λ of the light…
- Two coherent sources of different intensities send waves which interfere. The ratio of maximum intensity to the minimum…
- The focal length of a converging lens is measured for violet, green and red colours. It is respectively f v , f g , f r…
- A short linear object of length lies along the axis of a concave mirror of focal length f at a distance u from the…
- A cubical vessel has opaque walls. An observer (dark circle in figure below) is located such that she can see only the…
- The maximum intensity in Young’s double slit experiment is I0. Distance between the slits is d = 5λ, where λ is the…
- A transparent slab of thickness t and refractive index μ is inserted in front of upper slit of YDSE apparatus. The…
- In YDSE, find the thickness of a glass slab (μ = 1.5) which should be placed before the upper slit S1 so that central…
- In Young’s double slit experiment, the central bright fringe can be identified
- The figure shows a surface XY separating two transparent media, medium–1 and medium–2 . The lines ab and cd represent…
- Statement–1 : When a concave mirror is held under water, its focal length will increase. Statement–2 : The focal length…
- A thin rod of length f/3 lies along the axis of a concave mirror of focal length f. One end of its magnified image…
- In a double slit experiment if 5th dark fringe is formed opposite to one of the slits, the wavelength of light is
- A cube of side 2 m is placed in front of a concave mirror of focal length 1m with its face P at a distance of 3 m and…
- Assertion: Interference shows wave nature of light. Reason: Photoelectric effect proves particle nature of light.
- Statement-1 : Keeping a point object fixed, if a plane mirror is moved, the image will also move. Statement-2 : In case…
- If two +5 diopter lenses are mounted at some distance apart, the equivalent power will always be negative if the…
- In Young’s double slit experiment, the intensity of light coming from the first slit is double the intensity from the…
- In Young’s double slit experiment with a source of light of wavelength 6320Å, the first maxima will occur when
- When a light wave goes from air into water, the quantity that remains unchanged is its
- As the position of an object (u) reflected from a concave mirror is varied, the position of the image (v) also varies…
- An observer can see through a pin-hole the top end of a thin rod of height h, placed as shown in the figure. The beaker…
- If critical angle for a material to air is 30°, the refractive index of the material will be
- With respect to air critical angle in a medium for light of red colour [λ 1 ] is θ. Other facts remaining same…
- Consider the lens involved to be plano-convex lens (instead of equiconvex lens) of refractive index n and radius R in…
- In Young’s double-slit experiment setup with light of wavelength λ = 6000 Å, distance between the two slits is 2 mm and…
- In Young’s double-slit experiment setup with light of wavelength λ = 6000 Å, distance between the two slits is 2 mm and…
- A beam of electrons is used in an Young double slit experiment. The slit width is d . When the velocity of electron is…
- If the ratio of amplitude of two waves is 4 : 3, then the ratio of maximum and minimum intensity is
- In a Young’s double slit experiment, let β be the fringe width, and let I0 be the intensity at the central bright…
- Two ideal slits S1 and S2 are at a distance d apart, and illuminated by light of wavelength λ passing through an ideal…
- Statement-1 : A convex lens of focal length f (µ = 1.5) behaves as a diverging lens when immersed in carbon di-sulphied…
- The graph shows variation of v with change in u for a mirror. Points plotted above the point P on the curve are for…
- The apparent depth of water in cylindrical water tank of diameter 2R cm is reducing at the rate of x cm/minute when…
- When light from two sources (say slits S1 and S2) interfere, they from alternate dark and bright fringes. Bright…
- Statement–1 : Maximum possible angle of refraction in a medium is critical angle. Statement–2 : The critical angle θ c…
- Shown in the figure here is a convergent lens placed inside a cell filled with a liquid. The lens has focal length +20…
- Statement-1 : A fish inside a pond will see a person standing outside taller than he actually is. Statement-2 : Light…
- In Young’s experiment, if the distance between screen and the slit aperture is increased the fringe width will
- To demonstrate the phenomenon of interference, we require two sources which emit radiation
- Assertion: In YDSE, if separation between the slits is less than wavelength of light, then no interference pattern can…
- In Young’s double slit experiment, a mica slit of thickness t and refractive index μ is introduced in the ray from the…
- In Young’s double-slit experiment the fringe width is β. If entire arrangement is placed in a liquid of refractive…
- A lens of power +2 diopters is placed in contact with a lens of power –1 diopter. The combination will behave like
- Statement-1 : The critical angle in case of total internal reflection depends on the pair of medium chosen. Statement-2…
- In a two slit experiment with monochromatic light fringes are obtained on a screen placed at some distance from the…
- A flake of glass (refractive index 1.5) is placed over one of the openings of a double slit apparatus. The interference…
- When one of the slits of Young’s experiment is covered with a transparent sheet of thickness 4.8 mm, the central fringe…
- A ray of light falls on the surface of a spherical glass paper weight making an angle α with the normal and is…
- Initially there is a YDSE setup of red light and a glass slab (refractive index = 1.5) is put behind one of the source…
- One face of a rectangular glass plate 6 cm thick is silvered. An object held 8 cm in front of the first face, forms an…
- Two transparent slabs have the same thickness as shown. One is made of material A of refractive index 1.5. The other is…
- A parallel monochromatic beam of light is incident at an angle θ to the normal of a slit of width e. The central point…
- In the far field diffraction pattern of a single slit under polychromatic illumination, the first minimum with the…
- A double convex lens, made of a material of refractive index µ 1 , is placed inside two liquids or refractive indices µ…
- Assertion: If a glass slab is placed in front of one of the slits, then fringe width will decrease. Reason: Glass slab…