Question

# The focal lengths of objective and eye lens of anastronomical telescope are respectively $$2 m$$ and $$5 cm$$. Final image is formed at (i) least distance of distinct vision, (ii) Infinity. Magnifying power in two cases will be:

A
48,40
B
40,48
C
40,+48
D
48,+40

Solution

## The correct option is A $$-48, -40$$$$(i)\ M = \dfrac {f_o}{f_e} = \dfrac {5}{2m} \dfrac {200}{5} = -40$$$$(ii) \ M = \dfrac {-f_o}{f_e} (1 + \dfrac {5}{25}) = -40 [\dfrac {30}{25}] = -48$$PhysicsNCERTStandard XII

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