What is water glass?

Water glass is

Water glass is:

Water glass is:

Water glass is :

Water glass is :

Water glass is :

The refractive indices of glass and water are 1.54 and 1.33 respectively. What is the polarising angle for a beam of light going from water to glass ?

A glass of water contains ice cubes floating on it. When all ice melts the level of water in the glass