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Assertion: There is no dispersion of light refracted through a rectangular glass slab. Reason: Dispersion of light is the phenomenon of splitting of a beam of white light into its constituent colours.

Assertion: There is no dispersion of light refracted through a rectangular glass slab. Reason: Dispersion of light is the phenomenon of splitting of a beam of white light into its constituent colours. Correct Answer Both Assertion and Reason are true. Reason is not the correct explanation of Assertion.

CONCEPT:

Dispersion of light:

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  • Dispersion of light is the phenomenon of splitting of a beam of white light into its constituent colours when passing through a prism.
  • The band of seven colours so obtained is called the (visible) spectrum. 
  • Dispersion of white light occurs because the colours of white light travel at different speeds through the glass prism.

EXPLANATION:

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  • The refracting surfaces of a glass slab are parallel to each other.
  • When a light ray passes through a glass slab it is refracted twice at the two parallel faces and finally emerges out parallel to its incident direction i.e. the angle between the incident ray and emergent ray is 0°.
  • As all rays of all different colours emerge in the same direction (of incidence of white light), hence, there is no dispersion. Therefore the assertion is correct.
  • Dispersion of light is the phenomenon of splitting of a beam of white light into its constituent colours on passing through a prism.

Related Questions

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