Q16 of 79 Page 379

A thin transparent sheet is placed in front of a Young’s double slit. The fringe-width wilt

The fringe width is given by


As fringes are formed after the light passes from the film, the wavelength remains the same. So does d and D. Hence, fringe width remains the same.

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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

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The slits in a Young’s double slit experiment have equal width and the source is placed symmetrically with respect to the slits. The intensity at the central fringe is I0. If one of the slits is closed, the intensity at this point will be

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If Young’s double slit experiment is performed in water,

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A light wave can travel