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When a ray of light is refracted by a pr...

When a ray of light is refracted by a prism such that the angle of deviation is minimum, then

A

the angle of emergence is equal to the angle of incidence

B

the angle of emergence is greater than the angle of incidence

C

the angle of emergence is smaller than the angle of incidence

D

the sum of the angle of incidence and angle of emergence is equal to `90^@`

Text Solution

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The correct Answer is:
A
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(a) If the refracting angle of a prism is 60^@ and the minimum deviation is 30^@ , then find the angle of incidence. (b) A ray of light passes through an equilateral prism such that the angle of emergence is equal to the angle of incidence and each is equal to 3//4^(th) of the angle of prism. Find the angle of deviation. (c) The refracting of a prism is A and the refractive index of the material of the prism is cotA//2 . Find the angle of deviation. (d) The angle of a prism is 60^@ . What is the angle of incidence for minimum deviation? The refractive index of the material of the prism is sqrt2 .

In an isosceles prism of prism angle 45^(@) , it is found that when the angle of incidence is same as the prism angle, the emergent ray grazes the emergent surface. Find the refractive index of the material of the prism.For what angle of incidence the angle of deviation will be minimum ?

Knowledge Check

  • A ray of light is incident on a 60^(@) prism at the minimum of deviation position. The angle of refraction at the first face (i.e. incident face) of the prism is

    A
    zero
    B
    `30^(@)`
    C
    `45^(@)`
    D
    `60^(@)`

  • The angle of incidence for a ray of light at a refracting surface of a prism is 45^@ . The angle of prism is 60^@ . If the ray suffers minimum deviation through the prism, then the angle of minimum deviation is:

    A
    `30^@`
    B
    `60^@`
    C
    `45^@`
    D
    `90^@`

  • The angle of incidence for a ray of light at a refracting surface of a prism is 45^@ . The angle of prism is 60^@ . If the ray suffers minimum deviation through the prism, the angle of minimum deviation and refractive index of the material of the prism respectively, are:

    A
    `45^@, 1/(sqrt(2))`
    B
    `30^@, sqrt(2)`
    C
    `45^@, sqrt(2)`
    D
    `30^@, 1/(sqrt2)`

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    In an isosceles prism of angle 45^@ , it is found that when the angle of incidence is same as the prism angle, the emergen ray grazes the emergent surface. Find the refractive index of the material of the prism. For what angle of incidenc, the angle of deviation will be minimum?

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