Question

a) Can relative refractive index of material be less than unit?

b) What are the factors on which relative refractive index of pair of media depends.

c) Is power of lens depends upon aperture of lens.

pls answer the question​

Answer 1

Answer:

1. less than unity implies the speed of light in that material is greater than that in the vacuum, which is impossible. Relative RI can be less than unity
2. Refractive Index of a medium depends upon the refractive index of the surroundings, optical density ,wavelength of the light and temperature.
3. yes

poweris directly proportional to aperture