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A single slit of width 0.20mm is illumin...

A single slit of width `0.20mm` is illuminated with light of wavelength `500nm`. The observing screen is placed `80cm` from the slit. The width of the central bright fringe will be

A

(a) `1mm`

B

(b) `2mm`

C

(c) `4mm`

D

(d) `5mm`

Text Solution

Verified by Experts

The correct Answer is:
C
Width of central bright fringe.
`=(2lambdaD)/(d)=(2xx500xx10^-9xx80xx10^-2)/(0.20xx10^-3)`
`=4xx10^-3m=4mm`.
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