1.

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^(@)`

Answer» Correct Answer - 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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