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A linear aperture whose width is 0.02cm ...

A linear aperture whose width is `0.02cm` is placed immediately in front of a lens of focal length `60cm`. The aperture is illuminated normally by a parallel beam of wavelength `5xx10^-5cm`. The distance of the first dark band of the diffraction pattern from the centre of the screen is

A

0.10 cm

B

0.25 cm

C

0.20 cm

D

0.15 cm

Text Solution

Verified by Experts

The correct Answer is:
D

`(lamdaf)/(d)=x`
`x=(5xx10^(-5)xx60)/(0.02)`
`x=(300xx10^(-5))/(0.02)=0.15cm`
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