Validity of Ray Optics
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PHXII10:WAVE OPTICS

367937 For what distance is ray optics is good approximation when the aperture is \(4\;mm\) and the wavelength of light is \(400\;nm\)?

1 \(24\,m\)
2 \(40\,m\)
3 \(18\,m\)
4 \(30\,M\)
KCET - 2016
PHXII10:WAVE OPTICS

367938 For an aperture of size \(a\) illuminated by a parallel beam of light having wavelength \(\lambda\), the Fresnel distance is

1 \( \approx a/\lambda \)
2 \( \approx {a^2}/\lambda \)
3 \( \approx {a^2}\lambda \)
4 \( \approx a/{\lambda ^2}\)
NEET DIGITAL LIBRARY
PHXII10:WAVE OPTICS

367937 For what distance is ray optics is good approximation when the aperture is \(4\;mm\) and the wavelength of light is \(400\;nm\)?

1 \(24\,m\)
2 \(40\,m\)
3 \(18\,m\)
4 \(30\,M\)
KCET - 2016
PHXII10:WAVE OPTICS

367938 For an aperture of size \(a\) illuminated by a parallel beam of light having wavelength \(\lambda\), the Fresnel distance is

1 \( \approx a/\lambda \)
2 \( \approx {a^2}/\lambda \)
3 \( \approx {a^2}\lambda \)
4 \( \approx a/{\lambda ^2}\)
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