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.

What would've Rakesh observed if he had kept the prism inside the water instead of air and had passed the same white light through it?

White light would've passed through prism without splitting.

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The angle of deviation of each splitted ray would've increased.

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The angle of deviation of each splitted ray would've decreased.

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Splitted red light would've bent more than the splitted blue light.

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Solution

The correct option is C The angle of deviation of each splitted ray would've decreased.
If we keep a prism inside water instead of air, the refractive index of prism with respect to water will decrease. Thus, the angle of deviation of each colour will also decrease.

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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.

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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?

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The correct option is C The angle of deviation of each splitted ray would've decreased.If we keep a prism inside water instead of air, the refractive index of prism with respect to water will decrease. Thus, the angle of deviation of each colour will also decrease.

The correct option is C The angle of deviation of each splitted ray would've decreased.
If we keep a prism inside water instead of air, the refractive index of prism with respect to water will decrease. Thus, the angle of deviation of each colour will also decrease.