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 `:`

`37.3 cm`

`46.0 cm`

`50.0 cm`

`54.0 cm`

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The correct Answer is:

For objective
`1/(v_(0))=1/(u_(0))=1/(f_(0))`
`1/(v_(0))=1/(-200)=1/40to v_(d)=50 cm`
`L=v_(0)+f_(0)=50+4=54 cm`

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