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Light enters from air into a medium of refractive index 1.5, the percentage change in its wavelength is, 

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Important Questions on Interference and Diffraction

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Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 38

A cylindrical wavefront spreads from a line source which is comparable to a long and narrow slit. The wavefront is at a distance d from source then the amplitude of wave is proportional to

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Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 39

Assertion: Speed of light in glass is independent of the colour of light. Reason: The violet colour travels faster than the red light in a glass prism.

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Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 41
In Young's double slit experiment, the two slits are illuminated by light of wavelength 5890 Å and the angular distance between the fringes obtained on the screen is 0.2o. If the whole apparatus is immersed in water then the angular fringe width will be, if the refractive index of water is 43.
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Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 42
In Young's double-slit experiment, if the separation between slits is halved and the distance between the slit and screen is doubled, then the fringe width will become
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Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 43

If a thin membrane of thickness t and refractive index μ is introduced in the path of one wave out of the two waves producing interference, then the whole interference pattern will be shifted by a distance-

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Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 46
In Young's double-slit arrangement, water is filled in the space between screen and slits. Then:
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Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 47
In Young's double-slit experiment, the wavelength of red light is 7800 Å and that of blue light is 5200 Å. The value of n for which nth bright band due to red light coincides with (n+1)th the  bright band due to blue light is:
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Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 48
In Young's double-slit experiment, let A and B be the two slits. A thin film of thickness t and refractive index μ is placed in front of A. Let β= Fringe width. The central maximum will shift: