A spectrum is obtained by sending a beam of white light through a prism. A second prism exactly similar to the first one is placed in an inverted position with the sides parallel to the first. Now

A new spectrum will be formed on the screen with double the number of colours present in the previous spectrum

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New spectrum will be obtained on the screen with only half the number of colours present in the previous spectrum

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Previous spectrum will disappear and we will obtain a white light formed by the fusion of the colours

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A spectrum with same number of colours present in the previous spectrum will be formed but their wave lengths will be increased twice

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Solution

The correct option is C Previous spectrum will disappear and we will obtain a white light formed by the fusion of the colours
A spectrum is obtained by sending a beam of white light through a prism. A second prism exactly similar to the first one is placed in an inverted position with the sides parallel to the first. Now the previous spectrum will disappear and we will obtain a white light formed by the fusion of the colours.
As white is composed of seven colors. The seven colors together joins to form white light again.

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Similar questions

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 ?

Q. White light is split into a spectrum by a prism and it is seen on a screen. If we put another identical inverted prism behind it in contact, what will be seen on the screen?

Q. Draw a diagram to show how white light can be dispersed into a spectrum by using a glass prism. Mark the various colours of the spectrum.

Q. In the spectrum obtained with prism, which colour is deviated maximum?

When we place a glass prism in the path of a narrow beam of white light a spectrum is obtained. What happens when a second identical prism is placed in an inverted position with respect to the first prism? Draw a labeled ray diagram to illustrate it.

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