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In the given figure, a wavefront AB moving in air is incident on a plane glass surface XY. Its position ${CD}$ after refraction through a glass slab is shown in figure. The ratio of width of wavefront $AB$ to the refracted wavefront $CD$ is,

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Important Questions on Wave Theory of Light

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Assertion: Contribution of the wavelets lying on back on a wavefront is zero.

Reason: The contribution of a wavelet in any direction making angle $\theta$ with the wavelet is proportional to $\frac{1}{2}(1+\cos \theta)$. In this case, θ=180°.

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Which of the following generates a plane wavefront?
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The direction of wavefront of a wave with wave motion is,

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Which one of the following phenomena is not explained by Huygens' construction of wavefront?

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In Huygens' wave theory, the locus of all points in the same state of vibration is called
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Rays diverging from a point source form a ___ wavefront.
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A parallel beam of monochromatic light is incident on a glass slab at an angle of incidence $45^{\circ} .$ Find the ratio of width of beam in air to that in glass (If refractive index of glass is 1.5).

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On a hot summer night, the refractive index of air is the smallest near the ground and increases with a height from the ground. When á light beam is directed horizontally, the Huygens' principle leads us to conclude that as it travels, the light beam