Fill in the blank spaces with appropriate answers:
The nature of a lens changes if it is placed in a medium whose refractive index is __ than the refractive index of the material of the lens.

State whether the following statements are True (T) or False (F): The nature of the lens changes when it is immersed in a medium whose refractive index is more than the refractive index of the material of the lens.

Fill in the blank spaces with appropriate answers: The critical angle of light that incidents inside the denser medium is 30^@ . Then the refractive index of the material is __________.

A convex lens of focal length 20 cm in air is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Now the focal length will be

Refractive index of the material of any transparent medium is

Fill in the blank spaces with appropriate answers: The focal length of a divergent lens is 40 cm. The power of the lens is ___ Diopter.

Fill in the blank spaces with appropriate answers: A double convex air bubble in water behaves as a ______ lens.

Fill in the blank spaces with appropriate answers: The ________ of light does not change as it moves from one medium to another of different density.

Fill in the blank spaces with appropriate answers: The equation realting refractive index of a medium with the wavelength of light is the _________ equation.