Write a relationship between angle of incidence and angle of refraction for a given pair of media

Calculate the mass of ice required to lower the temperature of $300 \mathrm{g}$ of water at $40 °\mathrm{C}$  to water at $0 °\mathrm{C}$.

(Specific latent heat of ice $= 366 \mathrm{J} {\mathrm{g}}^{-1}$, Specific heat capacity of water $=$$4.2 \mathrm{J} {\mathrm{g}}^{-1} °{\mathrm{C}}^{-1}$)

What do you understand by the following statement:

The heat capacity of the body is $60 \mathrm{J} {\mathrm{K}}^{-1}$.