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In an experiment, Pooja used a equilater...

In an experiment, Pooja used a equilateral triangular glass prism and projected a narrow beam of white light source from one side of the surface of the prism. She placed a screen on the other side and saw many colours appearing as patches on the screen. But when she used a red light source, she could only see a red patch on the screen. Similarly she used a blue and green light source and could only see one colour patch on both occasions.
The phenomenon that she was trying to demonstrate was:

A

Dispersion

B

Reflection

C

Refraction

D

Scattering

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In an experiment, Pooja used a equilateral triangular glass prism and projected a narrow beam of white light source from one side of the surface of the prism. She placed a screen on the other side and saw many colours appearing as patches on the screen. But when she used a red light source, she could only see a red patch on the screen. Similarly she used a blue and green light source and could only see one colour patch on both occasions. The reason why she could no see any other colour when the red light was used was because:

In an experiment, Pooja used a equilateral triangular glass prism and projected a narrow beam of white light source from one side of the surface of the prism. She placed a screen on the other side and saw many colours appearing as patches on the screen. But when she used a red light source, she could only see a red patch on the screen. Similarly she used a blue and green light source and could only see one colour patch on both occasions. She also could relate to another natural phenomenon that we observe on a rainy humid day as the sun comes out. What could be that phenomenon?

Knowledge Check

  • A beam of white light is incident on a hollow prism of glass. Then

    A
    the light emerging from prism gives spectrum but the bending of all colours is always from base
    B
    the light emerging from prism gives spectrum, all the colours bend towards the base, the violet must and red and least
    C
    the light emerging from prism gives spectrum, all the colours bend towards base, the red the least and violet the most
    D
    the light emerging from prism gives no spectrum

  • A beam of white light is shone onto a glass prism. The light cannot be :

    A
    Deviated
    B
    Dispersed
    C
    Focused
    D
    Refracted

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