Question

Assertion (A): When rays of white light pass through a prism, on emerging they give spectrum of seven colours.
Reason (R): It is due to the scattering of light that red light bends minimum and violet light bends the maximum.

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

Hint:

Key differences:

• \textbf{Dispersion:} Splitting of white light into colours due to different bending (refraction) of different wavelengths.
• \textbf{Scattering:} Redirection of light by particles (e.g., blue sky, red sunset).
• In a prism, it's dispersion, not scattering!

Answer 1

The Correct Option is C

The question examines our understanding of the dispersion of light through a prism and the phenomenon associated with color separation. Let's break down the statements one by one:

1. Assertion (A): When rays of white light pass through a prism, on emerging, they give a spectrum of seven colors. This statement is true. A prism disperses white light into its constituent colors due to the phenomenon of dispersion. Each color travels at different speeds while passing through the prism, causing separation.
2. Reason (R): It is due to the scattering of light that red light bends minimum and violet light bends the maximum. This statement is false. The separation of colors in a prism is not due to scattering but due to dispersion. Dispersion occurs because different colors (wavelengths) of light refract at slightly different angles. Violet light bends more than red because it has a shorter wavelength and higher refractive index, not because of scattering.

In conclusion, the assertion is true as it accurately describes the phenomenon of dispersion when white light passes through a prism. However, the reason provided is incorrect because it attributes the phenomenon to scattering rather than dispersion. Therefore, the correct answer is:

Assertion (A) is true, but Reason (R) is false.