NEET | 2016Geometrical OpticsHard

Question

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

Options

A.

37.3 cm

B.

46.0 cm

C.

50.0 cm

D.

54.0 cm

Solution

 


1v-1-200=140
1v=55140-1200
=5200-1200
1v=4200=150
V = 50
∴ d = 50 + 4 = 54 cm

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