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प्रश्न
The refractive index of diamond is much greater than that of ordinary glass. Is this fact of some use to a diamond cutter?
उत्तर
Yes
The refractive index of diamond (2.42) is more than that of ordinary glass (1.5). The critical angle for diamond is less than that for glass. A diamond cutter uses a large angle of incidence to ensure that the light entering the diamond is totally reflected from its face. This is the reason for the sparkling effect of a diamond.
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संबंधित प्रश्न
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A narrow beam of light passes through a slab obliquely and is then received by an eye following figure. The index of refraction of the material in the slab fluctuates slowly with time. How will it appear to the eye? The twinkling of stars has a similar explanation.
A narrow beam of white light goes through a slab having parallel faces.
(a) The light never splits in different colours
(b) The emergent beam is white
(c) The light inside the slab is split into different colours
(d) The light inside the slab is white
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Locate the image formed by refraction in the situation shown in figure.
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What is Snell’s window?
Derive the equation for acceptance angle and numerical aperture, of optical fiber.
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`sin pi/4=1/sqrt2, sin30^circ=cos60^circ=1/2`
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`[sin^-1(1/1.5)=41.8^circ]`
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