Question

why is the critical angle for water is bigger than the critical angle of glass​

Answer 1

Explanation:

critical angle can be derived. The derivation is shown below.

ni *• sine(Θi) = nr • sine (Θr)

ni • sine(Θcrit) = nr • sine(90 degrees)

ni • sine(Θcrit) = nr

sine(Θcrit) = nr/ni

Θcrit= sine-1 (nr/ni) = invsine (nr/ni)

Answer 2

Hello Beautiful Mate ✨

For angles of incidence greater than the critical angle ALL the light is reflected back —this is known as TOTAL INTERNAL REFLECTION. Total internal reflection only happens when the light is travelling from the more dense material to the less dense i.e. glass to air, glass to water or water to air.

Hope it's helpful to you