H C Verma Solutions for Chapter: Light Waves, Exercise 2: OBJECTIVE I

The wavefronts of light coming from a distant source of unknown shape are nearly

The inverse square law of intensity (i.e., the intensity$\propto \frac{1}{r^2}$) is valid for a

Two sources are called coherent if they produce waves

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

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

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 $I_0$. If one of the slits is closed, the intensity at this point will be

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

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