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In a Fresnel’s diffraction arrangement, ...

In a Fresnel’s diffraction arrangement, the screen is at a distance of 2 meter from a circular aperture. It is found that for light of wavelengths `lambda_(1)` and `lambda_(2)` the radius of 4 th zone for `lambda_(1)` coincides with the radius of 5th zone for `lambda_(2)`. Then the ratio `lambda_(1) : lambda_(2)` is

A

`sqrt(4//5)`

B

`sqrt(5//4)`

C

`5//4`

D

`4//5`

Text Solution

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The correct Answer is:
C
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