The Fresnel distance 'F', where an aperture of size 'a' illuminated by – McqOptions

MCQOPTIONS

1.	The Fresnel distance 'F', where an aperture of size 'a' illuminated by a parallel beam of wavelength 'λ' is given by the formula _______.
A.	F = a2/λ
B.	F = a/λ
C.	F = a/λ2
D.	F = a2λ
Answer» B. F = a/λ

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