JEE PHYSICS MCQ: RAY OPTICS

1 Medium

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Analyzing +4 | -1

Two lenses, one concave and the other convex of same power are placed such that their principal axes coincide. If the separation between the lenses is

x

, then

View answer and explanation

Correct option: C

System will behave like a glass plate for

x=0

Option C (System will behave like a glass plate for x=0) is correct because when the lenses are in contact (x=0), the effective focal length becomes infinite.

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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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