Q. 3

In producing a pure spectrum, the incident light is passed through a narrow slit placed in the focal plane of an achromatic lens because slit.
A. produces less diffraction

B. increases intensity

C. allows only one color at a time

D. allows a more parallel beam when it passes through

Answer :

A parallel beam of light is required to be incident on the dispersing element to produce a pure spectrum. So, that incident light can be passed through a narrow slit placed in the focal plane of an achromatic lens.

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