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प्रश्न
What is meant by the statement, ‘the critical angle for diamond is 24°’?
उत्तर
It means that when a light ray is an incident inside a diamond at an angle greater than 24°, the light will be totally internally refracted.
Or R.I of diamond is 2.14, `[∵ 1/(sin24°) = 2.14]`
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संबंधित प्रश्न
State the relation between the critical angle and the absolute refractive index of a medium.
A light ray does not bend at the boundary in passing from one medium to the other medium if the angle of incident is ______.
Total internal reflection occurs only when a ray of light passes from a ______ medium to a ______ medium.
In the given figure PQ and PR are the two light rays emerging from an object P. The ray PQ is refracted as QS.
- State the special name given to the angle of incidence ∠PQN of the ray PQ.
- What is the angle of refraction for the refracted ray QS?
- Name the phenomenon that occurs if the angle of incidence ∠PQN is increased.
- The ray PR suffers partial reflection and refraction on the water-air surface. Give reason.
- Draw in the diagram the refracted ray for the incident ray PR and hence show the position of image of the object P by the letter P’ when seen vertically from above.
Calculate the speed of light in a medium whose critical angle is 30° ?
(a) A ray of monochromatic light enters glass PQRS as shown in the fig. Complete the path of ray till it emerges from the glass. (Critical angle of glass is 420).
(b) Draw diagram of a prism periscope.
(c) What are the advantages of total internal reflecting prism over plane mirror?
Name the principle on the basis of which optical fibres work.
How does a ray of light bend when it travels from rarer to denser medium
How are critical angles related to the refractive index of the medium?
Choose the correct option.
Select the WRONG statement.
