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A screen is placed 50cm from a single sl...

A screen is placed 50cm from a single slit, which is illuminated with 6000Å light. If distance between the first and third minima in the diffraction pattern is 3.0 mm, what is the width of the slit?

A

`0.1mm`

B

`0.2mm`

C

`0.3mm`

D

`0.4mm`

Text Solution

Verified by Experts

The correct Answer is:
B
`d sin theta = n lambda`
`dx//D = n lambda`
`:. x_(3) -x_(1) =(3lambda D)/(d)-(lambdaD)/(d) = (2lambdaD)/(d) = 0.2mm`
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