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Radius of central zone of circular zone ...

Radius of central zone of circular zone plate is 3.2 mm. Wavelength of incident light is . 5893 Å Source is at a distance of 6 m. Then the distance of first image will be

A

9 m

B

12 m

C

24 m

D

36 m

Text Solution

Verified by Experts

The correct Answer is:
A
Distance= `(r^(2))/(lambda)= ((2.3 xx 10^(-3))^(2))/(5893 xx 10^(-10))= 9m`
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