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  • How large can be aperture opening to work with laws of ray optics using a monochromatic light of wavelength 800 nm to a distance of around 20 m ?Option

How large can be aperture opening to work with laws of ray optics using a monochromatic light of wavelength 800 nm to a distance of around 20 m ?

Option: 1

6 mm


Option: 2

4 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=800 \mathrm{~nm}}, we have to estimate value of a.
Putting \mathrm{Z_F=\frac{\mathrm{a}^2}{\lambda}, \mathrm{a}=\sqrt{Z_{\mathrm{F}} \lambda}=4 \times 10^{-3} \mathrm{~m}}or \mathrm{4 \mathrm{~mm}}

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