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The first diffraction minima in a single...

The first diffraction minima in a single slit diffraction pattern is at `theta=30^(@)`, for light of wavelength=5000 Å. The width of the slit is

A

`2.5xx10^(-4)mm`

B

`5xx10^(-4)mm`

C

`7.5xx10^(-4)mm`

D

`10xx10^(-4)mm`

Text Solution

Verified by Experts

The correct Answer is:
D
`asintheta=lamda" "therefore a=(lamda)/(sintheta)`
`therefore a=(5xx10^(-7))/(1//2)=10xx10^(-7)m=10xx10^(-4)mm`
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