JEE Main 2022 · 28 Jul · Shift 1 · Physics Q46

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PhysicsSingle correct+4 / -1Question 46 of 90

In normal adjustment, for a refracting telescope, the distance between objective and eye piece is 30 cm. The focal length of the objective, when the angular magnification of the telescope is 2, will be :

20 cm

30 cm

10 cm

15 cm

Answer and worked solution

Official answer: A

Normal adjustment. $f_o+f_e=30$ and $\frac{f_o}{f_e}=2$ , so $f_o=20$ cm.

(A)

Topics:Optical instruments

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JEE Main 2022 · 28 Jul · Shift 1, Physics question 46