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प्रश्न
State the conditions required for total internal reflection of light to take place.
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उत्तर
- Light must travel from a denser medium to a rarer medium.
- The angle of incidence must be greater than the critical angle for the pair of media.
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संबंधित प्रश्न
Swarali has got the following observations while doing an experiment. Answer her questions with the help of observations.
Swarali observed that the light bent away from the normal, while travelling from dense medium to rarer medium. When Swarali increased the values of angle of incidence (i), the values of angle of refraction (r) went on increasing. But at a certain angle of incidence, the light rays returned into the dense medium.
So, Swarali has some questions. Answer them –
a) Name this certain value of ‘i ’. What is the value of ‘r’ at that time ?
b) Name this process of returning of light in dense medium. Explain the process.
Can light be ‘piped’ like sound in a doctor’s stethoscope?
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What can you say about the value of the angle of deviation in such a situation?
The diagram shows a point source P inside a water container. Three rays A, B, and C starting from P are shown up to the water surface. Show in the diagram the path of these rays after striking the water surface. The critical angle for the water-air pair is 48°.
A spherical marble, of refractive index 1.5 and curvature 1.5 cm, contains a tiny air bubble at its centre. Where will it appear when seen from outside?
State the condition under which total internal reflection occurs. Give the mathematical expression for total internal reflection.
A Rainbow is a beautiful natural phenomenon formed because of the following:
Find the value of θ in the given figure.
