HC Verma Class 11 Physics Solutions Chapter 17: Light Waves

About the chapter: HC Verma Class 11 Solutions Chapter 17

Scientists often call light waves “electromagnetic waves” because they are part of the electromagnetic spectrum. Wavelengths are usually measured in nanometers or Angstroms, which are billionths or ten billionths of a metre. From the top of one wave to the top of the next wave is how far away something is. People can see light with wavelengths from about 700 nm, which looks dark red, to about 400 nm, which looks violet. Violet light, which has a short wavelength, has more energy than light with a long wavelength (red). In 1704, Sir Isaac Newton wrote “Opticks” to explain some of the strange things about light.

Newton showed that the colours of sunlight are all connected to each other. By putting white light from the Sun through a glass prism, you can separate it into all the colours of the rainbow. He even put the coloured light through a second prism, which put it back together into white light. Later, other astronomers and physicists found new ways to use the spectrum to study light. And he found that light from any source, like a candle or a star, has different wavelengths that depend on which atoms and molecules give off the light. 

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