Q. 224.0( 16 Votes )
State the c
White light is a mixture of seven colors, red, orange, yellow, green, blue, indigo and violet. The dispersion of white light occurs because colors of white light travel at different speeds through the glass prism. The amount of refraction depends on the speed of colored light in glass.
• When white light consisting of seven colors falls on a glass prism, each color in it is refracted by a different angle, with the result that seven colors are spread out to form a spectrum. The red light bends the least, while violet bends the most. Newton's experiment with two identical prisms:
• When a beam of white light is passed through a glass prism, a band of seven colors is formed on a white screen. This band of seven colors is called spectrum of white light.
• Newton showed that the seven colored lights of the spectrum can be recombined to give back white light. First he tried to split the colors of the spectrum of white light using a prism.
• He then placed a second identical prism in an inverted position with respect to the first prism. This allowed all the colors of the spectrum to pass through the second prism. He found a beam of white light emerging from the other side of the second prism.
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