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Combinations of Lenses & Mirrors

In the collim...

Question

In the collimator of a spectroscope to obtain parallel beam of light, the distance between slit and convex lens must be equal to :

A

radius of curvature of lens

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B

refractive index of lens

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C

focal length of lens

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D

three times to focal length

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Solution

The correct option is C focal length of lens
The distance between the slit and the collimating lines is so adjusted that the slit lies in the focal plane of the lens and the rays coming from the collimator becomes parallel.

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