Question

Assertion (A) : White light is dispersed by a glass prism into seven colours.
Reason (R) : The red light bends the least while the violet the most when a beam of white light passes through a glass prism.

• A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
• B. Both Assertion (A) and Reason (R) are true and Reason (R) is not the correct explanation of Assertion (A).
• C. Assertion (A) is true, but Reason (R) is false.
• D. Assertion (A) is false, but Reason (R) is true.
  {5pt}

Answer 1

The Correct Option is A

Assertion (A): When white light enters a glass prism, it separates into its component colors (violet, indigo, blue, green, yellow, orange, red - VIBGYOR), a process known as dispersion. This assertion correctly identifies the seven colors of the visible spectrum. This is true.Reason (R): Different colors of light have varying wavelengths. The refractive index of glass is slightly different for each wavelength. Violet light (shorter wavelength) refracts more than red light (longer wavelength). Consequently, violet light bends more than red light when passing through a prism, with red light bending the least. This statement is true.Explanation: Reason (R) accurately explains the cause of dispersion (Assertion A). The varying refractive indices and subsequent differential bending of different colors of light within the prism material cause white light to split into its spectrum.\[Both (A) and (R) are true, and (R) correctly explains (A).\]