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Assertion : A total reflecting prism is ...

Assertion : A total reflecting prism is used to erect the inverted image without deviation.
Reason : Rays of light incident parallel to base of prism emerge out as parallel rays.

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
A

Beam of light incident on face AB, suffers refraction from air to glass and strikes the face AC suffering total intenal reflection. The beam now strikes the face BC of the prism at an angle of incidence less than the critical angle hence it suffers refraction from glass to air and bends away from the normal. The beam emerges out parallel to the base. As a result of refraction, on emergence the rays are inverted.
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Show by drawing a ray diagram, how a totally reflecting prism may be used to invert the image without changing its size and direction.

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Knowledge Check

  • The path of a refracted ray of light in a prism is parallel to the base of the prism only when the

    A
    light of a particular wavelength
    B
    ray is incident normally at one face
    C
    ray under goes minimum deviation
    D
    none of these

  • The path of a refracted ray of light in a prism is parallel to the base of the prism only when the

    A
    Light is of a particular wavelength
    B
    Ray is incident normally at one face
    C
    Ray undergoes minimum deviation
    D
    Prism is made of a particular type of glass

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    A
    If both assertion and reason are true and\ reason is a correct explanation of the assertion
    B
    If both assertion and reason are true but the reason is not a correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If assertion is false but reason is true

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