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Q.

A astronomical telescope has objective and eyepiece of focal lengths 20 cm and 4 cm respectively. To view an object 100 cm away from the objective, the lenses must be separated by a distance

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a

37.3 cm

b

46.0 cm

c

29.0 cm

d

54.0 cm

answer is C.

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Detailed Solution

1v0−1u0=1f0

1v0=1u0+1f0

=120+1−100=5−1100=4100=125

Tube length: v0+fe=25+4=29cm

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