Question

You can often see a reflection when looking at a sheet of glass, particularly if it is darker on the other side. Explain why you can often see a double image in such circumstances.

a) Light undergoes total internal reflection.

b) Light experiences constructive interference.

c) Light undergoes refraction and reflection.

d) Light experiences destructive interference.

Answer 1

A double image occurs when looking through glass because some light is reflected off the surface (first image) and some is refracted, then internally reflected (second image), exiting at a different location.

Step-by-step explanation:

When you look at a sheet of glass, particularly when it is darker on the other side, you often see a double image due to the phenomenon of reflection and refraction.

As light encounters the glass, part of it is reflected from the surface, creating the first image. Simultaneously, some light enters the glass, is refracted, and then reflects off the internal surface, exiting the glass at a different location and angle, creating a second image. This is why you can often see a double image in such circumstances.