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A slit of width a illuminated by red lig...

A slit of width `a` illuminated by red light of wavelength `6500 Å`. The first minimum will fall at `theta=30^(@)` if `a` is

A

`3250 Å`

B

`6.5xx10^(-4) mm`

C

`1.3 micron`

D

`2.6xx10^(-4) cm`

Text Solution

Verified by Experts

The correct Answer is:
C
`a sintheta=nlambda, n=1, 2, …`
`a sin 30^(@)=1xx6500`
`a=13000 Å=1.3xx10^(-6) m=1.3 mu m`
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