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Class 12 Physics Practice Test: Huygen's Principle
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The Huygens–Fresnel principle states that every point on a wavefront is itself the source of spherical wavelets, and the secondary wavelets emanating from different points mutually interfere. The sum of these spherical wavelets forms a new wavefront.

Class 12 Physics Practice Test: Huygen's Principle
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8 Questions

1. The absolute refractive indices of glass and water are \(\frac {3}{2}\) and \(\frac {4}{3}\). Determine the ratio of the speeds of light in glass and water.
2. The optical path of monochromatic light is the same if it travels 2 cm thickness of glass or 2.25 cm thickness of water. If the refractive index of water is 1.33, what is the refractive index of glass?
3. Which among the following isn’t a suitable phenomenon to establish that light is wave motion?
4. In Huygens’ theory, light waves are longitudinal and do not require a material medium for their propagation.
5. The speed of yellow light in a certain liquid is 2.4 × 108 m/s. Find the refractive index of the liquid.
6. The speed of light in air is 3 × 108 m/s. If the refractive index of glass is 1.5, find the time taken by light to travel a distance of 10 cm in the glass.
7. Identify the condition which is not necessary for two light waves to be coherent.
8. The refractive index of glass is 1.5 and that of water is 1.3, the speed of light in water is 2.25 × 108 m/s. What is the speed of light in glass?

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