Question

the ray of light does not bend when it is incident normally.will they have different speed in other medium. If yes why

Answer 1

no the Ray of light does not bend?

Answer 2

If the speed of the light is the same in both mediums, it doesn’t bend. But when light changes speed when going from one medium to another, the ray bends.

The light must be a continuous field at all points along its ray. An abrupt change in speed of the light changes the wavelength, but the frequency stays the same. If the ray bends, the light can satisfy the requirement of continuity.

Draw a periodic line on a piece of paper. That is, start at the left side of the paper and draw a curve that goes up and down as you move to the right. Like the surface of a water wave. Hold the paper in front of your eyes and rotate the paper so that one side of the paper moves farther away from your eyes. When the paper has been rotated 90 degrees, all you see is the edge of the paper.

In the above demonstration, the curve you drew on the paper is the ray. As you rotate the paper, the apparent spacing between points on the curve gets smaller. This is a demonstration of a wave that is slowed down in a new medium. The ray must bend to accommodate the requirement of being continuous and of the same frequency, but now slower in the new medium.
In other words, if the Ray doesn't bend, that means the densities of two media are equal and hence the speed will not change.
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