Question

Assertion: In the dispersion of white light by a prism, the red light bends the least. Reason: The frequency of red light is the highest.
Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
Our Assertion is true but the Reason is false The statement of the Assertion is false but the Reason is true. Both the statements are false.

Answer 1

Explanation:

Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion

Answer 2

Assertion is true but reason is false.

Explanation:

• Refractive index is the ratio of speed of light in vacuum to the speed of light in a medium.
• η$=\frac{c}{v}$ where c is the speed of light in vacuum and v is the speed of light in the medium.
• Refractive index for red light in prism = 1.52
• Refractive index for violet light in prism = 1.54
• Refractive index of glass for red light is less than than for violet light.
• This is the reason that speed of red is more than violet light because refractive index is inversely proportional to speed of light in that medium.
• And this is why red light bends less than violet light when entering prism.
• Violet light bends the most while undergoing dispersion.
• Wavelength of red is the highest and lowest wavelength is of violet light which concludes that frequency for violet light is highest in the visible spectrum.