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Let the refractive index of a denser med...

Let the refractive index of a denser medium with respect to a rarer medium be `n_(12)` and its critical angle be `theta_(c)`. At an angle of incidence A when light is travelling from denser medium to rarer medium, a part of the light is reflected and the rest is refracted and the angle between reflected and refracted rays is `90^(@)`, Angle A given by -

A

`"tan"^(-1)("sin" theta_(c))`

B

`(1)/("tan"^(-1) ("sin"theta_(c)))`

C

`"cos"^(-1) ("sin"theta_(c))`

D

`(1)/("cos"^(-1)("sin"theta_(c)))`

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • When light passes from a denser medium to a rarer medium

    A
    Velocity of light increases
    B
    Velocity of light decreases
    C
    Velocity of light remains unchanged
    D
    Velocity of light becomes infinity

  • 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

  • When a ray of light travels from a denser medium to a rarer medium, the ray will :

    A
    slow down and bend away from the normal
    B
    slow down and bend towards the normal
    C
    speed up and bend away from the normal
    D
    speed up and bend towards the normal

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