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A beam of light is partially reflected a...

A beam of light is partially reflected and partially refracted from a surface. The angle between reflected and refracted light ray is `90^(@)`. If the angle of refraction is `30^(@)`, the angle of incidence is

A

`60^(@)`

B

`48^(@)`

C

`45^(@)`

D

`90^(@)`

Text Solution

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The correct Answer is:
A
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AAKASH INSTITUTE-RAY OPTICS AND OPTICAL INSTRUMENTS-Assignment (Section - A) Objective Type Questions (One option is correct)
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  2. A glass slab of thickness 4 cm contains the same number of waves as 5 ...

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  3. A beam of light is partially reflected and partially refracted from a ...

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  4. A light ray is travelling from air to glass. True reflected and refrac...

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  5. A small object is placed 20 cm in front of a block of glass 10 cm thic...

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  6. A denser medium of refractive index 1.5 has a concave surface of radiu...

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  7. A point object is situated at a distance of 36 cm from the centre of t...

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  8. In a medium of refractive index 1.6 and having a convex surface has a ...

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  9. Light travels in two media A and B with speeds 1.8 × 10^(8) m s^(–1) a...

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  10. Light takes t(1) second to travel a distance x cm in vacuum and the sa...

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  11. In the figure shown , for an angle of incidence 45^(@), at the top sur...

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  12. A fish is a little away below the surface of a lake. If the critical a...

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  13. A parallel beam of monochromatic light falls on a combination of a con...

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  14. The magnifications produced by a convex lens for two different positio...

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  15. Three lenses in contact have a combined focal length of 12 cm. When th...

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  16. A lens made of material of Refractive index mu(2) is surrounded by a m...

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  17. The radii of curvatures of a convex lens are 0.04 m and 0.04m. Its ref...

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  18. For a plano convex lens, the radius of curvature of convex surface is ...

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  19. A convex glass lens (mu(g) = 1.5) has a focal length of 8 cm when plac...

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  20. A light ray is incident normally on one of the refracting faces of a p...

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