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  4. A plane monochromatic light falls normally on a diaphragm with two narrow slits separated by a distance d=2.5 mm. A fringe pattern is formed on the screen placed at D=100 cm behind the diaphragm. If one of the slits is covered by a glass plate of thickness 10 μ m, then distance by which these fringes will be shifted will be :

Q. A plane monochromatic light falls normally on a diaphragm with two narrow slits separated by a distance . A fringe pattern is formed on the screen placed at behind the diaphragm. If one of the slits is covered by a glass plate of thickness , then distance by which these fringes will be shifted will be :

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Solution:

If shift of fringes is then we use


Questions from Wave Optics

1. Which of the following phenomena support the wave theory of light ?
(a) scattering
(b) interference
(c) diffraction
(d) velocity of light in a denser medium is less than the velocity of light in the rarer medium

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2. In Young's double slit experiment, how many maxima can be obtained on a screen (including central maxima), if (where is the wavelength of light)?

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3. Light of wavelength is incident normally on a slit of width . The angular width of central maxima in the diffraction pattern is (measured from minimum to minimum)

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4. Using monochromatic light of wavelength , an experimentalist sets up the Young's double slit experiment in three ways as shown.
If she observes that y = the wavelength of light used is :

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5. At two points P and Q on a screen in Young's double slit experiment, waves from slits and have a path difference of 0 and respectively. The ratio of intensities at P and Q will be :

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