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प्रश्न
Define critical angle for a given medium.
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उत्तर
When a ray of light propagates from a denser medium to a rarer medium, the angle of incidence for which the angle of refraction is 90° is called the critical angle.
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संबंधित प्रश्न
A ray of light travels from water to air as shown in the diagram given below :
1) Copy the diagram and complete the path of the way. Given the critical angle for water is 48°.
2) State the condition so that internal reflection occurs in the above diagram.
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.
Write the necessary conditions for the phenomenon of total internal reflection to
occur ?
Name the principle on the basis of which optical fibres work.
Choose the correct option.
Select the WRONG statement.
Answer the following question.
Define the critical angle of incidence and obtain an expression for it.
Answer the following question.
Why is prism binoculars preferred over traditional binoculars? Describe its working in brief.
A bundle of glass threads, each of which is capable of transmitting messages using light waves is called ______.
The angle of incidence at which the angle of refraction is Q£ is called the critical angle.
An endoscope uses optic fiber to transmit high resolution images of internal organs without loss of information. The principle of light that is used by the optic fiber is based on ______.
