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The wavelength range of white light is :...

The wavelength range of white light is :

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reasonb is false

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
D
Both the assertion and reason are false.
Fringe width `beta =(lambda D)/(d)`. This depends on the wavelength. Diffraction depends on the wavelength of light. Therefore if a white source of light is used, only the central fringe will be white. All the rest have different wavelengths and some orders will also ovelap for diffeent colours. Both the assertion and the reason are false because the fringe width is not independent of wavelength.
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