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White light is incident from under water...

White light is incident from under water on the the water-air interface. If the angle of incidence is slowly increased from zero, the emergent beam coming out into the air will turn from

A

white to violet

B

white to red

C

white to black

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
After a certain angle all colours get total internally refrected.
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DC PANDEY ENGLISH-REFRACTION OF LIGHT-Level 1 Objective
  1. The power in dioptre of an equi-convex lens with radii of curvature of...

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  2. The refractive index of water is 4//3. The speed of light in water is

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  3. White light is incident from under water on the the water-air interfac...

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  4. When light enters from air to water, then its

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  5. In the figure shown sin i/sin r is equal to

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  6. In figure, the reflected ray B makes an angle 90^@ with the ray C. If ...

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

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  8. A thin equi-convex lens is made of glass of refractive index 1.5 and i...

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  9. A ray of light, travelling in a medium of refractive index 'mu, is inc...

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  10. The given equi-convex lens is broken into four parts and rearranged as...

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  11. A thin convergent glass lens (mug=1.5) has a power of +5.0D. When this...

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  12. Two convex lenses of focal length 10 cm and 20 cm respectively placed ...

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  13. A prism can have a maximum refracting angle of (thetaC=critical angle ...

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  14. A ray is ihncident at an angle of incidence ii on one surface of a pri...

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  15. The refracting angle of a prism is A and refractive index of the mater...

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  16. A prism of refractive index sqrt2 has refractive angle 60^@. In the or...

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  17. The focal length of a combination of two lenses is doubled if the sep...

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  18. A convexo-concave convergent lens is made of glass of refractive index...

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  19. An optical system consists of a thin convex lens of focal length 30 cm...

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  20. In the figure shown, the angle made by the light ray with the normal i...

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