The refractive indices of ice and glass are 1.31 and 1.52, respectively. A ray of light passes from ice to glass. The refractive index of glass with respect to ice is ______ and the ray bends ______ the normal in glass.

Refractive index of ice (  n_ice ) = 1.31Refractive index of glass (  n_glass ) = 1.52

1. Refractive index of glass with respect to ice ( n_glass,ice ) 
​$$n_{\text{glass,ice}} = \frac{n_{\text{glass}}}{n_{\text{ice}}}$$​​
​$$n_{\text{glass,ice}} = \frac{1.52}{1.31}\approx 1.16$$​​
2. Direction of bending:
When light travels from a medium with a lower refractive index (ice) to a medium with a higher refractive index (glass), it slows down and bends toward the normal.
Refractive index of glass with respect to ice: 1.16
The ray bends toward the normal in glass.

​