JEE PHYSICS MCQ: RAY OPTICS

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A small telescope has an objective lens of focal length

150 \mathrm{~cm}

and eyepiece of focal length

5 \mathrm{~cm}

. What is the magnifying power of the telescope for viewing distant objects in normal adjustment?
If this telescope is used to view a

100 \mathrm{~m}

tall tower

3 \mathrm{~km}

away, what is the height of the image of the tower formed by the objective lens?

View answer and explanation

Correct option: A

0.05 \mathrm{~m}

Option A (

0.05 \mathrm{~m}

) is correct because it is the height of the image formed by the objective lens, calculated using the angular size of the tower and the focal length of the objective lens.

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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

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16 {~mm}

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8 {~mm}

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