Question

For what distance is ray optics a good approximation
when the aperture is 3 mm wide and the wavelength is 500 nm?​

Answer 1

Explanation:

Solution :

For distance Z≤ZF, ray optics is the good appropriate

Fresnel distance ZF=a2λ=(3×10−3)25×10−7=18m

Answer 2

Answer:

Given:

Aperture Width a=4mm

Fresnel distance, Z

F

=

λ

a

2

=

500×10

−9

(4×10

−3

)

2

∴z

p

=32m