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Estimate the distance for which ray optics is good approximation for an aperture of 4 mm and wavelength 400 nm.
Solution:
Fresnel distance required for a sufficient spreading of central bright fringe, so that diffraction is appreciable
So, for distance less than 40 m between slit and screen, ray optics is a good approximation as within this distance, the spreading is negligible.
Check the complete chapter with solutions.
NCERT Solutions for 12th Class Physics: Chapter 10-Wave Optics