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  • How large can be the aperture opening to work with laws of ray optics using a monochromatic light of wavelength 450 nm to a distance of around 20 m?Option: 1</st

How large can be the aperture opening to work with laws of ray optics using a monochromatic light of wavelength 450 nm to a distance of around 20 m?

Option: 1

6 mm


Option: 2

3 mm


Option: 3

2 mm


Option: 4

8 mm


Answers (1)

best_answer

Now, here we are given Fresnel distance equal to \mathrm{20 \mathrm{~m} \lambda=450 \mathrm{~nm}}, we have to estimate value of a.
Putting \mathrm{Z_F=\frac{a^2}{\lambda}, a=\sqrt{Z_F \lambda}=3 \times 10^{-3} \mathrm{~m}\, \, or \, \, 3 \mathrm{~mm}}

Posted by

Ritika Harsh

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