A spectrum is formed by a prism of dispe...

A spectrum is formed by a prism of dispersive power `'omega'` if the angle of deviation is `'delta'` then the angular dispersion is

`omega//delta`

`delta//omega`

`1// omegadelta`

`omega delta`

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The dispersive power ( omega ) of the material of prism is given by

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When a ray of sun light passes through the prism each colour of light has its own speed in the glass. The seven colours come out of the prism with different angles of deviation. Red deviates least and violet deviates maximum. Thus a prism can disperse a white light into seven colours which is called colour spectrum. For a thin prism the angle of deviation delta =(n-1) A deviation is given. The angle of dispersion is given as theta = delta v - delta r . The dispersive power is omega = theta / delta mean Using the above ideas give answer the following questions A prism has R.I. for violet and red ” =1.523 n =1.5145 If the angle of prism is A= 2° the dispersive power of the prism is : 0.01639 1.593 0.1639 0.18

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The refractive indices of a prism for red, violet and yellow lights are 1.52, 1.62 and 1.59 recp.What is the dispersive power of the prism ? If mean deviation is 40^(@) . What is angular dispersion produced by the prism ?

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