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Total internal reflection of a light ray...

Total internal reflection of a light ray travelling from denser medium to rare medium occurs only when angle of incidence is

A

`45^@`

B

`90^@`

C

acute

D

more than a certain value

Text Solution

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The correct Answer is:
C
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The observations made by Swarali while 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 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?

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?

Knowledge Check

  • Total internal reflection occurs when light travels from

    A
    a denser medium to a rarrer medium with angle of incidence greater than critical angle
    B
    a rarer medium to a denser medium
    C
    a denser medium to a rarer medium
    D
    a rarer medium to a denser medium with angle of incidence greater than critical angle

  • A ray of light travelling obliquely from denser to rarer medium

    A
    bends towards the normal
    B
    bends away from the normal
    C
    does deviate from its path
    D
    none of these

  • Total internal reflection is possible when light rays travel

    A
    Air to water
    B
    Air to glass
    C
    Glass to water
    D
    Water to glass

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