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Estimate the distance for which ray optics is good approximation for an aperture of 4 mm and wavelength 400 nm.
  • a)
    45 m
  • b)
    50 m
  • c)
    40 m
  • d)
    55 m
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Estimate the distance for which ray optics is good approximation for a...
Here,
Aperture, a = 4 mm = 4 × 10-3 m
Wavelength, λ = 400 nm = 400 × 10-9 m = 4 × 10-7 m 
Ray optics is good approximation upto distances equal to Fresnel's distance (ZF).
Fresnel's distance is given by,
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