A lens having focal length f and aperture of diameter d forms an image of intensity I …
Physics · Class 12 · CBSE — Ray Optics & Optical Instruments
A lens having focal length f and aperture of diameter d forms an image of intensity I. Aperture of diameter 
in central region of lens is covered by a black paper. Focal length of lens and intensity of image now will be respectively
in central region of lens is covered by a black paper. Focal length of lens and intensity of image now will be respectively
Answer
(D)
Sign up free on Edukali to view the step-by-step worked solution and practice thousands of similar questions.
Related practice questions
- The speed of light in two media '1' and '2' are v_ 1 and v_ 2 ( v_ 1 ) respectively. For a ray of light to…
- A point object is placed in air at a distance of 4R on the principal axis of a convex spherical surface of…
- A thin symmetrical double convex lens of power P is cut into three parts, as shown in the figure. Power of A…
- A lens is a transparent medium bounded by two surfaces, with one or both surfaces being spherical. The focal…
- A ray of light travels from a denser to a rarer medium. After refraction, it bends away from the normal. When…
- For a glass prism ( = 3 ) the angle of minimum deviation is equal to the angle of the prism. The angle of the…
- The frequency of a light wave in a material is 2 10 14 Hz and wavelength is 5000 A . The refractive index of…
- A compound microscope consists of two converging lenses. One of them, of smaller aperture and smaller focal…
More Ray Optics & Optical Instruments questions · Browse all practice questions