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Dispersion of White Light by Glass Prism

What colours ...

Question

What colours lie on the two sides of the 'green colour' in the spectrum of white light ?

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Solution

Yellow And Blue.

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Q. A light bulb

14 W

emits white light, which is a mixture of various colours in the spectrum. The energy is distributed among the seven colours i.e., red, orange, yellow, green, purple, indigo and blue. If the number of photons

n

emitted from each colour is equal, then the frequency of green colour is (The frequency of all the colours of white light are in AP)

(\frac{n}{time}) = 5.5 \times 10^{18} s^{- 1}

A ray of white light is passed through a glass prism and spectrum is obtained on a screen.

(a) Name the seven colours of the spectrum in order.

(b) Do the colours have the same width in the spectrum ?

(c) Which of the colour of the spectrum of white light deviates (i) the most, (ii) the least ?

Q. (a) What is spectrum ? What is the name of glass shape used to produce a spectrum ?
(b) How many colours are there in a full spectrum of white light ? Write the various colours of spectrum in the order. starting with red.

In the spectrum of white light, how many colours have a wavelength less than that of yellow colour?

Q. When white light splits in seven colours, the phenomenon is called spectrum.

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