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The observations made by Swarali value d...

The observations made by Swarali value doing the experiment are given below. Based on these write answers to the questions `:`
Swarali found that the light ray travelling from the denser medium to a rarer medium goes away from the normal. If the mangle of incidence (i) is raised by Swarali, the angle of refraction ( r ) went on increasing,. However, after certiain value of the angle of incidence, the light ray is seen to return back into the denser medium.
(i) What is the specific value of `/_ i` called ?
(ii) What is the process of reflection of incident ray into a denser medium called ?
(iii) Draw the diagrams of three observations made by Swarali.

Text Solution

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(i) Critical angle.
(ii) Total internal reflection
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The observation made by Swarali while doing the experiment are given below . Based on these write answers to the following question : Swarali found that the light ray travelling from the denser medium to a rarer medium goes away from the normal. If the angle of incidence (i) is raised by Swarali, the angle of refraction(r) went on increasing . However, after certain value of the angle of incidence , the light ray is seen to return back into the denser medium. What is the specific value of anglei called?

The observation made by Swarali while doing the experiment are given below . Based on these write answers to the following question : Swarali found that the light ray travelling from the denser medium to a rarer medium goes away from the normal. If the angle of incidence (i) is raised by Swarali, the angle of refraction(r) went on increasing . However, after certain value of the angle of incidence , the light ray is seen to return back into the denser medium. Draw the diagrams of three observations made by Swarali?

The observation made by Swarali while doing the experiment are given below . Based on these write answers to the following question : Swarali found that the light ray travelling from the denser medium to a rarer medium goes away from the normal. If the angle of incidence (i) is raised by Swarali, the angle of refraction(r) went on increasing . However, after certain value of the angle of incidence , the light ray is seen to return back into the denser medium. What is the process of reflection of incident ray into denser medium called?

Light is travelling from a denser medium to a rarer medim along a normal to the boundary:

When light passes from a denser medium to a rarer medium