Wave Optics — practice questions
111 curated practice questions from Wave Optics (Physics Class 12, CBSE) — 96 easy, 12 medium, 3 hard. Every question includes the final answer free; step-by-step worked solutions with a free account.
- A double slit is illuminated by light of wavelength 6000 Å. The slits are 0.1 cm apart and the screen is placed 1 m…
- Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible…
- The principle of superposition is used to understand the phenomenon of interference of light waves. The principle…
- A narrow slit of width 2 mm is illuminated by monochromatic light of wavelength 500 nm. The distance between the first…
- The angle between pass axis of polarizer and analyser is 45°. The percentage of polarized light passing through…
- A diffraction pattern is obtained using a beam of red light. What happens if the red light is replaced by blue light?
- If an interference pattern has maximum and minimum intensity in the ratio of 36 : 1, then what will be the ratio of…
- In a Young’s double slit experiment, the source is white light. One of the holes is covered by a red filter and another…
- The colours seen in the reflected white light from a thin oil film are due to
- What is the minimum thickness of a soap film needed for constructive interference in reflected light, if the light…
- In Young’s double slit experiment, one of the slits is wider than the other, so that the amplitude of the light from…
- The intensity ratio of the maxima and minima in an interference pattern produced by two coherent sources of light is 9…
- The British physicist Thomas Young explained the interference of light using the principle of superposition of waves…
- Which of the following is the path difference for distructive interference ?
- In a double slit interference pattern, the first maxima for infrared light would be
- A parallel beam of light of wavelength 500 nm falls on a narrow slit and the resulting diffraction pattern is observed…
- Wavefront is the locus of all points, where the particles of the medium vibrate with the same
- Consider the following statements in case of Young’s double slit experiment. (1) A slit S is necessary if we use an…
- According to Huygens principle, the amplitude of secondary wavelets is
- In the case of light waves from two coherent sources S 1 and S 2 , there will be constructive interference at an…
- In a Young’s double slit experiment an electron beam is used to obtain interference pattern. If the spread of electron…
- In Young's double slit experiment the slits are separated by 0.28 mm and the screen is placed 1.4 m away. The distance…
- In the wave picture of light, the intensity I of light is related to the amplitude A of the wave as:
- In Young’s double slit experiment two disturbances arriving at a point P have phase difference of . The intensity of…
- The British physicist Thomas Young explained the interference of light using the principle of superposition of waves…
- Light is incident on a glass surface at polarizing angle of 57.5°. Then the angle between the incident ray and the…
- The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 Å is of the order of
- Interference fringes were produced in Young’s double slit experiment using light of wavelength 5000 Å. When a film of…
- In Young's double-slit experiment, the slits are 2 mm apart and are illuminated by photons of two wavelengths _ 1 =…
- The two coherent sources with intensity ratio b produce interference. The fringe visibility will be
- If the angle between the pass axis of the polarizer and the analyzer is 45°, the ratio of the intensities of original…
- The critical angle of a certain medium is ^ -1 ( 3 5 ) . The polarizing angle of the medium is
- A parallel beam of sodium light of wavelength 5890 Å is incident on a thin glass plate of refractive index 1.5 such…
- If there are N atoms in a source of Laser light and each atom is emitting light with intensity I , then the total…
- A parallel beam of light of wavelength 600 nm is incident normally on a slit of width d . If the distance between the…
- Yellow light of wavelength 6000 Å produces fringes of width 0.8 mm in Young’s double slit experiment. If the source is…
- In Young’s double slit experiment the ratio of intensity of the maxima and minima in the interference experiment is 25…
- In Young’s double slit experiment, the fringe width with light of wavelength 6000 Å is 3 mm . The fringe width, when…
- In a single-slit diffraction experiment, the width of the slit is halved. The width of the central maximum, in the…
- The principle of superposition is used to understand the phenomenon of interference of light waves. The principle…
- In a two slit experiment with monochromatic light, fringes are obtained on a screen placed at some distance from the…
- Assertion (A): To observe diffraction of light, the size of the obstacle/aperture should be of the order of 10 -7 m…
- Assertion (A): Corpuscular theory fails in explaining the velocities of light in air and water. Reason (R): According…
- In a Frensnel biprism experiment the two positions of lens give separation between the slits as 16 cm and 9 cm…
- Unpolarized light is incident on a plane glass surface. The angle of incidence so that reflected and refracted rays are…
- In a double slit experiment using light of wavelength 600 nm, the angular width of a fringe on a distant screen is…
- A parallel beam of light of wavelength 6000 Å gets diffracted by a single slit of width 0.3 mm. The angular position of…
- A laser beam is used for locating distant objects because
- In Young's double slit experiment, light waves of wavelength 5.4 × 10 2 nm and 68.5 × 10 1 nm are used in turn, keeping…
- Figure shows a standard two slit arrangement with slits S 1 , S 2 and P 1 , P 2 are the two minima points on either…
- Two monochromatic light waves of amplitudes 3 A and 2 A interfering at a point have a phase difference of 60°. The…
- Young's experiment is performed with light of wavelength 6000 Å wherein 16 fringes occupy a certain region on the…
- In young’s double slit experiment using monochromatic light of wavelengths λ, the intensity of light at a point on the…
- In a Young’s double slit experiment, let S 1 and S 2 be the two slits, and C be the centre of the screen. If ∠ S 1 CS 2…
- Two coherent light waves, each having amplitude 'a', superpose to produce an interference pattern on a screen. The…
- A screen is placed 50 cm from a single slit which is illuminated with light of wavelength 6000 Å. If the distance…
- The principle of superposition is used to understand the phenomenon of interference of light waves. The principle…
- When the angle of incidence is 60° on the surface of a glass slab, it is found that the reflected ray is completely…
- The idea of secondary wavelets for the propagation of a wave was first given by
- In a Young's double slit experiment, (slit distance d ) monochromatic light of wavelength is used and the fringe…
- Assertion (A): Colours are seen in thin layers of oil on the surface of the water. Reason (R): White light is composed…
- Consider sunlight incident on a pinhole of width 10 3 Å. The image of the pinhole seen on a screen shall be
- In Young’s double slit experiment distance between two sources is 0.1 mm. The distance of screen from the source is 20…
- An unpolarized light beam is incident on a surface at an angle of incidence equal to Brewster’s angle. Then,
- Consider a ray of light incident from air onto a slab of glass (refractive index n ) of width d , at an angle q . The…
- The fringe width in a young’s double slit interference pattern is 2.4 × 10 –4 m, when red light of wavelength 6400 Å is…
- The phenomenon which is not explained by Huygens' construction of wavefront:
- In a double slit experiment, the distance between the slits is d . The screen is at a distance D from the slits. If a…
- Two sources of light of wavelength 2500 Å and 3500 Å are used in Young’s double slit experiment simultaneously. Which…
- The relationship between phase difference and the path difference x between two interfering waves is given by: =…
- Consider sunlight incident on a slit of width 10 4 Å. The image seen through the slit shall
- The principle of superposition is used to understand the phenomenon of interference of light waves. The principle…
- Assertion (A): In interference and diffraction of light, light energy reduces in one region producing a dark fringe. It…
- A slit of width d is illuminated by white light. The first minimum for red light ( = 6500 Å) will fall at = 30° when d…
- Radio waves diffract around buildings, although light waves do not. The reason is that radio waves
- If the width of the slit in single slit diffraction experiment is doubled, then the central maximum of diffraction…
- The principle of superposition is used to understand the phenomenon of interference of light waves. The principle…
- Light of wavelength 600 nm is incident on an aperture of size 2 mm. The distance upto which light can travel such that…
- The British physicist Thomas Young explained the interference of light using the principle of superposition of waves…
- Two light emitting sources of wavelength 500 nm are separated by a distance 2.2 10 -2 cm. A detector can be moved on…
- When ordinary light is made incident on a quarter wave plate, the emergent light is
- An Young’s double slit experiment uses a monochromatic source of light. The shape of interference fringes formed on the…
- The wavefront due to a source situated at infinity is
- When a wave undergoes reflection at an interface from rarer to denser medium, change in its phase is:
- A plane wave passes through a convex lens. The geometrical shape of the wavefront that emerges is
- A small transparent slab containing material of µ = 1.5 is placed along AS 2 as shown in figure. What will be the…
- Assertion (A): The phase difference between any two points on a wavefront is zero. Reason (R): All points on a…
- In Young’s double slit experiment the distance d between the slits S 1 and S 2 is 1 mm. What should the width of each…
- The slits in Young’s double slit experiment are illuminated by light of wavelength 6000 Å. If the path difference at…
- Two coherent waves, each of intensity I _ 0 , produce interference pattern on a screen. The average intensity of light…
- Spherical wave fronts, emanating from a point source, strike a plane reflecting surface. What will happen to these wave…
- In a double slit experiment the distance between slits is increased ten times whereas their distance from screen is…
- Two slits are made one millimeter apart and the screen is placed one metre away. The fringe separation when blue green…
- The British physicist Thomas Young explained the interference of light using the principle of superposition of waves…
- Light from two coherent sources of the same amplitude A and wavelength λ illuminates the screen. The intensity of the…
- In a Young’s double slit experiment, the angular width of a fringe formed on a distant screen is 1°. The slit…
- Transverse nature of light was confirmed by the phenomenon of
- In a double slit experiment the angular width of a fringe is found to be 0.2° on a screen placed 1 m away. The…
- A diffraction pattern is obtained by using beam of red light what will happen, if red light is replaced by the blue…
- For what distance is ray optics a good approximation when the aperture is 4 mm wide and the wavelength is 500 nm?
- Phase difference between any two points of a wavefront is
- Two light waves superimposing at the mid-point of the screen are coming from coherent sources of light with phase…
- A transparent thin plate of a polaroid is placed on another similar plate such that the angle between their axes is…
- Two periodic waves of intensities I 1 and I 2 pass through a region at the same time in the same direction. The sum of…
- At what angle of incidence will the light reflected from glass ( m = 1.5) be completely polarised
- The two slits are 1 mm apart from each other and illuminated with a light of wavelength 5 × 10 –7 m. If the distance of…
- Consider a light beam incident from air to a glass slab at Brewster’s angle as shown in figure. A polaroid is placed in…
- The British physicist Thomas Young explained the interference of light using the principle of superposition of waves…
- Two slits in young’s double slit experiment have widths in the ratio 81 : 1. The ratio of the amplitudes of light waves…
- The velocity of light in air is 3 × 10 8 m s –1 and that in water is 2.2 × 10 8 m s –1 . The polarising angle of…
- Assertion (A): In double slit experiment if one slit is closed, diffraction pattern due to the other slit will appear…