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Light of 600 nm incidents on an obstacle...

Light of 600 nm incidents on an obstacle a it diffracts very less upto 15 m, then find line dimension of obstacle.

A

3 mm

B

2 mm

C

4 mm

D

5 mm

Text Solution

Verified by Experts

The correct Answer is:
A
Fresnel distance is the distance upto which lig diffracts very less.
`Z_(f)=(a^(2))/(lambda)`
`:.a=sqrt(Z_(f)lambda)`
`= sqrt(1500xx6xx10^(-5))`
`=sqrt(9000xx10^(-5))`
`=sqrt(9x10^(-2))=3xx10^(-1) cm=3 mm`
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