JEE PHYSICS MCQ: RAY OPTICS

1 Medium

1 of 1

Application +4 | -1

A telescope with objective of focal length

60 {~cm}

and eyepiece of focal length

5 {~cm}

is focused on a far off distant object such that parallel rays emerge from the eyepiece. If object subtends an angle of

2^{\circ}

on the objective, angular width of the image will be

View answer and explanation

Correct option: C

24^o

Option C (

24^o

) is correct because the angular magnification of a telescope is the ratio of the focal lengths of the objective and eyepiece, and the angular width of the image is the magnification times the angle subtended by the object.

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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}

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8 {~mm}

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