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When a drop of oil is spread on a water surface, it displays beautiful colors in daylight because of

When the light rays fall on the oil, a part of it is reflected while some is refracted. This refracted ray undergoes multiple reflection inside the oil and is transmitted turn by turn. These multiple reflected rays interfere and form beautiful colors.

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11

The inverse square law of intensity (i.e., the intensity ∝ 1/r2 is valid for a

 12

Two sources are called coherent if they produce waves

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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

 15

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