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Question: If an object subtend angle of 2<sup>0</sup> at eye when seen through telescope having objective and ...

If an object subtend angle of 20 at eye when seen through telescope having objective and eyepiece of focal length fo=60 cmf _ { o } = 60 \mathrm {~cm} and fe=5 cmf _ { e } = 5 \mathrm {~cm} respectively than angle subtend by image at eye piece will be

A

160

B

500

C

240

D

100

Answer

240

Explanation

Solution

By using β=24∘\beta = 24 ^ { \circ }