In an experiment, Rakesh used an equilateral triangular glass prism and projected a narrow beam of white light source from one side of the surface of the prism. He placed a screen on the other side and saw many colours appearing as patches on the screen. But when he placed a second identical prism in an inverted position with respect to the first prism, he found a beam of white light emerging out from the other side of the second prism.

If Rakesh had passed a monochromatic light through the prism, then which of the following phenomenon would be observed?

Dispersion

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Refraction

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Reflection

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Scattering

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Solution

The correct option is B Refraction
He will only be able to see the refraction of the light through the prism, not the dispersion because the source of light he is using is monochromatic, which is the light of only single wavelength.

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Q. Case: Pooja did an experiment with an equilateral glass prism in which she projected a narrow beam of white light source from one side of the surface of the prism and placed a screen on the other side of the prism. She observed certain patches of different colours on the screen. Later, she repeated the same experiment with a red-light source, however, she could only observe a red coloured patch on the screen. Again, she repeated the experiment with blue and green light sources, respectively, and could only see one colour patch on both the occasions.

The reason why she could not see any other colour when the red light was used as source because:

Q. A student is performing an experiment with two triangular glass prisms. He places the first glass prism on its base. The second glass prism is placed upside down behind the first glass prism. When a beam of white light is allowed to fall on the first glass prism, then a patch of ordinary white light is obtained on a screen placed behind the second glass prism.
(a) Draw a ray diagram to show the above arrangement of two glass prisms and the light passing through them.
(b) What is the function of (i) first prism, and (ii) second prism, in this arrangement?

Q. Rakesh wanted to do the prism experiment, he took a prism and passed a monochromatic light through the prism. Which of the following phenomenon would he observe?

Q. How will you use two identical prisms so that a narrow beam of white light incident on one prism emerges out of the second prism as white light?

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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The correct option is B RefractionHe will only be able to see the refraction of the light through the prism, not the dispersion because the source of light he is using is monochromatic, which is the light of only single wavelength.

The correct option is B Refraction
He will only be able to see the refraction of the light through the prism, not the dispersion because the source of light he is using is monochromatic, which is the light of only single wavelength.