name a compound that is used in black and white photography. give a balanced chemical equation when it is exposed to light . name the type of reaction.

SILVER BROMIDE [AgBr] is the compound used.

2AgBr ---- 2Ag + Br2

And also,

SILVER CHLORIDE (AgCl)is also used..

2AgCl ----2Ag + Cl2

This type of reactions are called photolytic decomposiion.