Question

Explain the following :
Bubbles rising up in a fish tank appear silvery.

Answer 1

• Total internal reflection: The phenomenon due to which a ray of light, while traveling from an optically denser medium to an optically rarer medium, gets reflected into the optically denser medium, at the surface of separation is called total internal reflection.
• Bubbles rising up in a fish tank appear silvery due to total internal reflection.
• When light rays strike the bubbles at an angle greater than $48°\mathrm{C}$ which is the critical angle of water, they impart a silver color to the bubbles.