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The distance for which ray optics becomes a good approximation for an aperture of 0.3 cm and a light of wavelength 6000 $\text{\AA}$ is

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The Fresnel distance $z_F = a^2/\lambda$ gives the maximum distance for which the effects of diffraction are negligible, and geometric optics (ray optics) holds true. Beyond this distance, diffraction must be considered.

Updated On: Mar 30, 2026

12 m
15 m
24 m
30 m

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The Correct Option is B

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The distance for which ray optics becomes a good approximation for an aperture of 0.3 cm and a light of wavelength 6000 $\text{\AA}$ is

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The Correct Option is B

Solution and Explanation

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