JEE PHYSICS MCQ: WAVE OPTICS

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An astronomical telescope has an angular magnification of magnitude 5 for distant objects. The separation between the objective and eye-piece is

36 \mathrm{~cm}

and the final image is formed at infinity:
(a) the focal length of objective is

30 \mathrm{~cm}

(b) the focal length of objective is

25 \mathrm{~cm}

6 \mathrm{~cm}

(d) the focal length of eye piece is

12 \mathrm{~cm}

View answer and explanation

Correct option: D

(a) and (c) are correct

Option D ((a) and (c) are correct) is correct because the focal lengths of the objective and eyepiece are 30 cm and 6 cm respectively, satisfying the magnification and length conditions.

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