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Class XII Physics Wave Optics 2

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Question 1

Refractive index of a thin soap film of a uniform thickness is 1.34. Find the smallest thickness of the film that gives an interference maximum in the reflected light when light of wavelength 5360 Å falls at normal incidence

Question 2

In Young’s double slit experiment when wavelength used is 6000 Å and the screen is 40 cm from the slits, the fringes are 0.012 cm apart. What is the distance (in cm) between the slits?

Question 3

A double slit is illuminated by two wavelengths 450 nm and 600 nm. What is the lowest order at which minima of 600 nm wavelength coincide with maxima of 450 nm?

Question 4

Yellow light emitted by sodium lamp in Young's double slit experiment is replaced by the monochromatic blue light of the same intensity-

Question 5

Two coherent sources of different intensities send waves which interfere. The ratio of maximum intensity to the minimum intensity is 25. The intensities of the sources are in the ratio-

Question 6

The Young's double slit experiment is performed with blue and with green light of wavelengths 4360 Å and 5460 Å respectively. If X is the distance of 4^th maximum from the central one, then -

Question 7

In a certain double slit experimental arrangement, interference fringes of width 1.0 mm each are observed when light of wavelength 5000 Å is used. Keeping the set-up unaltered if the source is replaced by another of wavelength 6000 Å, the fringe width (in mm) will be -

Question 8

The double slit experiment of Young has been shown in figure. Q is the position of the first bright fringe on the right side and P is the 11^th bright fringe on the other side as measured from Q. If wavelength of the light used is 6000 Å, S₁B, will be equal to -

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Oct 17JEE & BITSAT