Light from a monochromatic laser torch is made to fall one by one on: A - a glass prism B - a rectangular glass slab Which optical phenomenon will take place in A and B respectively?

A swimming pool appears shallower than it actually is when viewed from above. This optical illusion is caused by:

When a light ray passes from one transparent medium to another, which of the following properties change? (J) Velocity (K) Frequency (L) Wavelength (M) Direction of propagation Choose the correct option: