Question

Light travels more quickly through water than through glass.

1. Which is optically denser: water or glass?
2. If a ray of light passes from glass into water, which way will it bend: towards the normal or away from the normal?

Answer 1

1. Glass is optically denser than water. (The speed of light in an optically rarer medium is more than the speed of light in a denser medium.)
2. If a ray of light passes from glass to water, it will bend away from the normal because glass is a denser medium than water.