Physics
Assertion : The refractive index of a medium decreases with increase in wavelength of incident light.
Reason : The refractive index of a medium decreases with increase in temperature of medium.
- Both Assertion and Reason are true.
- Both Assertion and Reason are false.
- Assertion is false but Reason is true.
- Assertion is true but Reason is false.
Answer
Both Assertion and Reason are true.
Reason — The speed of light is different for different colours because the light travels slower in case of minimum wavelength which leads to increase in refractive index. The refractive index of a medium decreases with increase in temperature of medium. Since, the velocity of light increases with increase in temperature of medium.
Therefore,
μT1 > μT2, as T1 < T2
Related Questions
Which of the following cannot be a decay product from the parent nuclei?
- An isotope of parent nuclei
- An isobar of parent nuclei
- More stable daughter nuclei
- None of the above
The refractive indices of kerosene oil, water and turpentine oil are 1.44, 1.33 and 1.87, respectively. In which of these material light travel faster?
- kerosene oil
- Turpentine oil
- Water
- Same in all
Which one of the following is a reliable measure?
- Hotness
- Coldness
- Temperature
- None of these