During dispersion of white light by a prism, the red colour deviates most.

During dispersion of white light, which colour (a) deviates least, (b) deviates most?

Durind dispersion of light, the least dispersed colour is :

In the spectrum of white light by a prism, the colour at the extreme end opposite to the base of prism is :

The angular dispersion produced by a prism

Explain the phenomenon of dispersion of white light through a glass prism, using suitable ray diagram.

What is the cause of dispersion of white light through a glass prism Draw a ray diagram to show the path of light when two identical glass prisms are arranged together in inverted position with respect to each other and narrow beam of white light is allowed to fall obliquely on one of the faces of the prisms.

(a) Define refraction and state at least three examples of refraction. (b) Describe dispersion of white light into its constituent colours.

Explain the cause of dispersion of white light through a prism.

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 blue 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 is given as delta=(n-1)A . The angle of dispersion is given as phi=delta_(v)-delta_(r) . The dispersive power of a prism is omega=(phi)/(delta_("mean"))=(phi)/(delta_(y)) Using the above ideas, give answer the following questions. A prism has R.I. for violet and red n_(v)=1.523, n_(r)=1.5145 . If the angle of prism is A=2^(@) the dispersive power of the prism is :

(a) The blusih colour predominates in clear sky . (b) Voilet colour is seen at the bottom of the spectrum when white light is dispersed by a prism. State resons to explain these observations.