JEE PHYSICS MCQ: RAY OPTICS

1 Medium

1 of 1

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In human eye the focussing is done by

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Correct option: C

Change in the convexity of the lens surface

Option C (Change in the convexity of the lens surface) is correct because the ciliary muscles adjust the shape of the lens to focus light on the retina.

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In refraction, light waves are bent on passing from one medium to the second medium, because, in the second medium A double convex lens is made of glass which has its refractive index 1,45 for violet rays and 1.50 for red rays. If the focal length for violet ray is

20 \mathrm{~cm}

, the focal length for red ray will be Which light rays undergoes two internal reflection inside a raindrop, which of the rainbow is formed? A piece of plane glass is placed on a word with letters of different colours. The letters which appear minimum raised are A dentist has a small mirror of focal length

16 {~mm}

. He views the cavity in the tooth of a patient by holding the mirror at a distance of

8 {~mm}

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