Question

Why does a light- refract when it goes through prism? How does the glass bend the light ray?

Answer 1

Hint : A light-weight ray may be a line (straight or curved) that's perpendicular to the light's wavefronts; its tangent is collinear with the wave vector. Light rays in homogeneous media are straight. They bend at the interface between two dissimilar media and should be curved during a medium during which the index of refraction changes.

Complete Step By Step Answer:
Due to the differences within the refraction index between the air and therefore the glass, light bends once entering the prism. Since the edges are angled, the sunshine bends even more when it exits the prism. What makes this refraction so artistically interesting is that different wavelengths of sunshine refract differently.
The glass slows down the sunshine waves as they enter the new medium at an angle. If the sunshine ray entered the glass at a 90o angle there would be no refraction as all of the sunshine would be slowed at an equivalent time. When the sunshine ray enters the glass at an angle the vanguard of the ray that enters the medium first slows down while the remainder of the ray slows down later, this causes the sunshine to refract or bend.

Note :
Light refracts whenever it travels at an angle into a substance with a special index of refraction (optical density). This alteration of direction is caused by a change in speed. When light travels from air into water, it slows down, causing it to vary direction slightly. This alteration of direction is named refraction.