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A ray of light passes through an equilat...

A ray of light passes through an equilateral glass prism in such a manner that the angle of incidence is equal to the angle of emergence and each of these angles is equal to `3//4` of the angle of the prism. The angle of deviation is

A

`45^@`

B

`39^@`

C

`20^@`

D

`30^@`

Text Solution

Verified by Experts

The correct Answer is:
D
When `i=i^'`, `delta=delta_m`
`i=i^'=(3A)/(4)`
`delta_m=(i+i^')-A=2xx(3A)/(4)-A=A/2=60^@/2=30^@`
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CP SINGH-REFRACTION OF LIGHT BY PLANE SURFACES-Exercises
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  2. If the refracting angle of a prism is 60^@ and the minimum deviation i...

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  3. A ray of light passes through an equilateral glass prism in such a man...

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  4. A prism of apex angle A=60^@ has the refractive index mu=sqrt2. The an...

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  5. A parallel beam of monochromatic light is incident at one surface of a...

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  6. A ray of light is incident normally on one of the faces of a prism of ...

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  7. A ray of light is incident normally on one face of an equilateral pris...

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  8. A prism having refractive index sqrt2 and refractive angle 30^@ has on...

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  9. A ray falls on a prism ABC(AB=BC) and travels as shown in adjoining fi...

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  10. A glass prism of refractive index 1.5 is immersed in water (refractive...

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  11. A prism of angle 60^@ deviates a ray of light through 32^@ for two ang...

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  12. The maximum value of index of refraction of a material of a prism whic...

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  13. Two beams of red and violet colours are made to pass separately throug...

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  14. When a glass prism of refracting angle 60^(@) is immersed in a liquid ...

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  15. Angle of prism is A and its one surface is silvered. Light rays fallin...

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  16. Three prisms 1, 2 and 3 have the prism angle A = 60^(@), but their ref...

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  17. A ray of light is incident at small angle I on the surface of prism of...

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  18. A light ray is incident on a prism in minimum deviation position and s...

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  19. An isosceles prism of angle 120degree has a refractive index 1.44. Two...

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  20. Two parallel light rays are incident at one surface of a prism of refr...

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