Question

When a narrow beam of monochromatic light passes through?
Give answer in the point :​

Answer 1

Answer:

When a narrow beam of monochromatic light passes through:

Glass slab: It deviates from the actual path but the direction of the incident ray and the emergent ray of light are parallel to each other.

Answer 2

Answer:

But when a monochromatic light passes through a prism, the ray of light will be bent by the same amount. ... And hence to conclude, monochromatic light passing through a prism can be deviated due to difference in the medium but cannot be dispersed, since it contains wave of single wavelength unlike white light.