हिंदी

Two isosceles right-angle glass prisms P and Q are placed near each other as shown in Fig. Complete the path of the light ray entering the prism P till it emerges out of the prism Q.

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प्रश्न

Two isosceles right-angle glass prisms P and Q are placed near each other as shown in Fig. Complete the path of the light ray entering the prism P till it emerges out of the prism Q.

 

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अध्याय 4: Refraction of Light at Plane Surfaces - EXERCISE - 4 (D) [पृष्ठ १०२]

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सेलिना Concise Physics [English] Class 10 ICSE
अध्याय 4 Refraction of Light at Plane Surfaces
EXERCISE - 4 (D) | Q 29. | पृष्ठ १०२

संबंधित प्रश्न

The diagram below shows a point source P inside a water container. Four rays A, B, C, D starting from the source P, are shown up to the water surface.

  1. Show in the diagram the path of these rays after striking the water surface. The Critical Angle for the water-air surface is 48°.
  2. Name the phenomenon which the rays B and D exhibit.

Draw diagram to illustrate the total internal reflection.


Write the necessary conditions for the phenomenon of total internal reflection to

occur ?


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.

 


Define critical angle and explain total internal reflection. What are the conditions necessary for total internal reflection?

Express the refractive index μ of a medium in terms of the angle of incidence i in air and the angle of refraction r in a denser medium.


A ray of light incident at an angle of incidence ‘i’ passes through an equilateral glass prism such that the refracted ray inside the prism is parallel to its base and emerges from the prism at an angle of emergence ‘e’.

What can you say about the value of the angle of deviation in such a situation?


Draw a diagram, properly labelled, to illustrate the use of a total reflecting prism (a right-angled isosceles prism) to turn a ray of light through 180°. Name an instrument in which this device is used.


Explain ‘mirage’ as an illustration of refraction.


A ray of light passes from vacuum into a medium of refractive index µ, the angle of incidence is found to be twice the angle of refraction. Then the angle of incidence is ______.


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