Q118 / 150 · MHT CET 2026 (15 April Shift 2) · Physics
In the phenomenon of refraction of light for the same angle of incidence
- Aangle of refraction is same for different colours.
- Correct answerBangle of refraction is different for different colours.
- Cangle of refraction does not depend upon the colour of the light used.
- Dangle of refraction depends on critical angle.
Solution
According to Snell's law, $\dfrac{\sin i}{\sin r} = \mu$, where $\mu$ is the refractive index of the medium.
The refractive index of a medium depends on the wavelength of light according to Cauchy's relation $\mu = A + \dfrac{B}{\lambda^2}$.
Since different colours of light have different wavelengths, the refractive index $\mu$ is different for different colours.
Therefore, for a given angle of incidence $i$, the angle of refraction $r$ will be different for different colours.
Answer: angle of refraction is different for different colours.
The refractive index of a medium depends on the wavelength of light according to Cauchy's relation $\mu = A + \dfrac{B}{\lambda^2}$.
Since different colours of light have different wavelengths, the refractive index $\mu$ is different for different colours.
Therefore, for a given angle of incidence $i$, the angle of refraction $r$ will be different for different colours.
Answer: angle of refraction is different for different colours.
Hence, the correct answer is option: 'B'.