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Given: width of aperture d=3mm and lambd...

Given: width of aperture `d=3mm` and `lambda=500nm`. For what distance ray optics is a good approximation?

A

(a) `18m`

B

(b) `18nm`

C

(c) `18Å`

D

(d) 18 light years

Text Solution

Verified by Experts

The correct Answer is:
A
`D_F=d^2/lambda`
`D_F=((3xx10^-3)(3xx10^-3))/(500xx10^-9)m`
`=90/5m=18m`
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