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A prism having refractive index sqrt2 an...

A prism having refractive index `sqrt2` and refractive angle `30^@` has one of the refractive surfaces polished. A beam of light incident on the other surfaces will trace its path if the angle of incidence is

A

`0^@`

B

`30^@`

C

`45^@`

D

`60^@`

Text Solution

Verified by Experts

The correct Answer is:
C
If beam retraces its path, for this, ray must be incident normally on silvered surface.

`1xxsini=musin30^@`
`sini=sqrt2xx1//2=1/sqrt2=sin45^@`
`i=45^@`
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CP SINGH-REFRACTION OF LIGHT BY PLANE SURFACES-Exercises
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  2. A ray of light is incident normally on one face of an equilateral pris...

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

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

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

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

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

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

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

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

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

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

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

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

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

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  16. P is small angled prism of angle 3^(@) made of a material of refractiv...

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  17. Light is incident normally on face AB of a prism as shown in Figure. A...

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  18. A beam of white light is incident on a hollow prism of glass. Then

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  19. For a small angled prism, angle of prism A of minimum deviation(delta)...

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  20. The graph between angle of deviation (delta) and angle of incidence (i...

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