SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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White light is a mixture of seven colours.
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The different colours of light is reflected at different angles in a glass prism.
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The prism adds colour to the white sunlight.
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Light travels at high speed.
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Detailed explanation-1: -Red will have more speed and violet will have least speed. Hence, all colours of white light are refracted by different amounts while passing through the glass prism. Therefore, when a white light passes through a glass prism, different constituent colours come out of the prism at different angles.
Detailed explanation-2: -White light is made up of seven bands of colors each having different wavelengths. Upon passing through a medium, each of the colors travels at different speeds and hence has different angles of refraction leading to the splitting of the light i.e. dispersion.
Detailed explanation-3: -Among the 7 constituent colours of light, violet light has the least wavelength and hence it deviates the most and red light having the largest wavelength deviates the least. Hence, the required order is violet, indigo, blue, green, yellow, orange, red (VIBGYOR).
Detailed explanation-4: -When white light is incident on a prism, the constituent colours get refracted through different angles and get dispersed. So, the rays of each colour emerge along different paths and become distinct. Hence, we get a spectrum of seven different colours.