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ASSERTION AND REASON
  • A.Both A and R are true and R is the correct explanation of A.
  • B. Both A and R are true but R is NOT the correct explanation of A.
  • C. A is true but R is false.
  • D. A is false but R is true.

ASSERTION- A white light on passing through prism splits into its component colours as such that the red light emerges nearest to the base of the prism.
REASON- Wavelength of red light is more than other component colors and hence red light deviates least.

Pls answer the question giving suitable explanantions

A
 
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Correct answer will be :

Option D

Reason:

Dispersion takes place because the refractive index of medium for different wavelengths (colours) is different. The refractive index is inversely proportional to l Since red is more than other colours wavelength. So, deviation is least for red and it appears farthest from the base of the prism.

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