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Explain why (a) A diamond glitters in ...

Explain why
(a) A diamond glitters in a brightly lit room, but not in a dark room.
(b) A crack in a window pane appears silvery.
( c) The bubbles of air rising up in a water tank appear silvery when viewed from top.

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(a) A diamond glitters in a brightly lit room because light entering the diamond from any face suffers multiple total internal reflections and does not come out. The diamond appears illuminated from inside. This would not happen in a dark room.
(b) A crack in a window pane appears silvery on account of total internal reflection of light in the crack.
( c) The bubbles of air rising up in a water tank appear silvery when viewed from top again on account of total internal reflection of light from the bubble.
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PRADEEP-RAY OPTICS-Conceptual problem(b)
  1. Can the relative refractive index of a medium w.r.t. another medium be...

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  2. Can the absolute value of refractive index of a medium be less than un...

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  3. When light comes from air to glass, the refracted ray is bent towards ...

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  4. If a plane glass slab is placed on letters of different colours, then ...

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  5. The critical angle for glass air interface is C and for glass water in...

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  6. Why does a diamond shine ?

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  7. Explain why (a) A diamond glitters in a brightly lit room, but not i...

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  8. Path of ray of light passing through three liquids of refractive indic...

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  9. A ray of light after refraction through a concave lens becomes paralle...

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  10. The surfaces of the sun glasses (goggles) are curved, yet their power ...

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  11. Calculate the position of the image of an object when placed at (a) ...

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  12. A concave lens made of a material of refractive index n1 is kept in a ...

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  13. Following data was recorded for values of object distance and the corr...

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  14. A thin lens focal length f(1) and its aperture has diameter d. It form...

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  15. When does a convex lens behave as a concave lens ?

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  16. A lens immersed in a transparent liquid becomes invisible. Under what ...

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  17. A lens is forming the image of an object on its axis. If the lens is p...

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  18. What happens to focal length of a convex lens when it is immersed in w...

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  19. The radii of curvature of both the surfaces of a lens are equal. How w...

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  20. A convex lens of refractive index mug is held in a reansparent medium ...

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