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At what angle for the first - order diff...

At what angle for the first - order diffraction, spacing between two planes respectively is `lambda and (lambda)/(2)`?

A

`0^(@), 90^(@)`

B

`90^(@), 0^(@)`

C

`30^(@), 90^(@)`

D

`90^(@), 30^(@)`

Text Solution

Verified by Experts

The correct Answer is:
C
It first case
`2d sin theta=nlambda`
`2lambda sin theta = lambda (n=1)`
` sin theta =1//2, theta=30^(@)`
In second case
`2d sin theta=nlambda`
`2lambda//2 sin theta=nlambda`
`sin theta =1, theta=90^(@)`
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