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An aperture of size a is illuninated by ...

An aperture of size a is illuninated by a parallel beam of light of wavelength `gamma`. The distance at which ray optics has a good approximation is

A

a. `(a^(2))/(lambda)`

B

b. `(lambda)/(a^(2))`

C

c. `(lambda)/(a ) `

D

d. `(lambda^(2))/(a)`

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The correct Answer is:
A
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