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A student is observing a diagram showing the path of a ray of light passing through a glass prism. He would find that for all angles of incidence the ray of light bends: - Science

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MCQ

A student is observing a diagram showing the path of a ray of light passing through a glass prism. He would find that for all angles of incidence the ray of light bends:

Options

  • towards the normal, while entering the prism and away from the normal while emerging from the prism

  • away from the normal while entering the prism and towards the normal while emerging from the prism

  • away from the normal while entering as well as while emerging from the prism

  • towards the normal while entering as well as while emerging from the prism

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Solution

When a ray of light enters a glass prism, it travels from a rarer medium to a denser medium. So, the ray of light bends towards the normal.

When the ray of light emerges from the glass prism, it travels from a denser medium to a rarer medium. So, the ray of light bends away from the normal.

Hence, the correct option is A.

Concept: Dispersion of Light Through Prism and Formation of Spectrum
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