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An astronomical telesope has objective a...

An astronomical telesope has objective and eyepiece of focal lengths `40cm` and `4 cm` respectively. To view an object `200cm` away from the objective, the lenses must be separated by a distance `:`

A

37.3 cm

B

46.0 cm

C

50.0 cm

D

54.0 cm

Text Solution

Verified by Experts

The correct Answer is:
4
Lens formula for objective lens
`1/v - 1/u = 1/f`
`1/v + 1/200 = 1/40`
`:. ` v = 50 cm
This image should be at focus of an eye piece. Hence d = 50 + 4 = 54 cm
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