When a ray is refracted from one medium into another, the wavelegths changes from `6000Å` to `4000Å`. The critical angle for a ray from the second medium will be

When a light ray is refracted from one medium into another, the wavelength changes from 4500overset(o)(A) to 3600overset(o)(A) . The critial angle for a ray from second medium to first medium is

When a ray of light is going from one medium to another its

When a ray of light enter from one medium to another, its velocity is doubled. The critical angle for the ray for two internal reflection will be

When a light ray travels from one medium to another with the same refractive index,

When a ray of light enters from one medium to another, then which of the following does not change?

Light ray bends when it travels from one medium to another medium because ......