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Single Slit Diffraction

In producing ...

Question

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

A

produce less diffraction

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B

increase intensity

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C

allows only one colour at a time

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D

allows a more parallel beam when it passes through the lens.

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Solution

The correct option is D allows a more parallel beam when it passes through the lens.
If the slit is wide, different part of the slit produces different spectra, which overlap resulting in impure spectrum. Therefore narrow slit is used as it allows more parallel beam of light when it passes through the lens.

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