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You are given prisms made of crown glass...

You are given prisms made of crown glass and flint glass with a wide variety of angles. Suggest a combination of prims which will
a. deviate a pencil of white light without much dispersion
b. disperse (and displace ) a pencil of white light without much deviation

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Two identical prisms made of the same glass placed with their bases on opposite sides (of the incident white light) and faces touching (or parallel will neither deviate nor disperse, but will mearly produce a parallel displacement of the beam.
a . To deviate without dispersion, choose , say the first prism to be crown glass, and take for the second prism a flint glass prism of suitably chosen refracting angle (smaller than that of crown glass prism because the fiint glass prism disperses more ) so that dispersion due to first is nullified by the second.
b. To disperse without deviation , increase the angle of flint glass prism (i.,e try flint glass prisms of greater and greater angle ) so that deviations due to the two prisms are equal and opposite. (the flint glass has higher refractive index than that of crown glass ). Because of the adjustments involved for so many colours, these are not meant to be precise arrangments for the purpose required.
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A crown glass prism of angle 5^@ is to be combined with a flint glass prism in such a way that the mean ray passes undeviated. Find (a) the angle of the flint glass prism needed and (b) the angular dispersion produced by the combination when white light goes through it. Refractive indices for red, yellow and viloet light are 1.514, 1.517 and 1.523 respectively for crown glass and 1.613 1.620 and 1.632 for flint glass.

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An equilateral glass prism has a refractive index of 1.5 Calculate the (a) angle of incidence for minimum deviation, (b) the minimum deviation, (c) the angle of emergence of the light at the maximum deviation .

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Read the passage and Answer the following question: In, vacuum the velocity of light radiation with different wavelength is the same. But in a material medium, the velocity of different colour radiations is not the same and they travel with different paths. Due to this, the refractive index of the medium is different for different colours. If white beam of light is incident on a glass prism, the angle of refraction for different colours is different. When Sunlight is incident on a refracting surface, then it gets split into seven coloured spectrum and emerges out. The splitting of light into its component colours is called dispersion. Sir Isaac Newton was the first to use a glass prism to obtain the spectrum of Sunlight. A glass prism is transparent medium bounded by two plane surfaces inclined at an angle. When white light is dispersed into seven colours by a prism, different colours of light bend through different angles with respect to incident ray. Out of these seven colours, red light bends the least, while violet light bends the most. So, the rays of each colour emerge along different paths and becomes distinct. Hence, we get spectrum of seven - different colours. Q. How do emergent rays appear ?

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A flint glass prism and a crown glass prism are to be combined in such a way that the deviation of the mean ray is zero. The refractive index of flint and crown glasses for the mean ray are 1.620 and 1.518 respectively. If the refracting angle of the flint prism is 6.0^@ , what would be the refracting angle of the crown prism ?

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