Explain the difference between reflection and refraction

Difference between reflection and refraction :

For example:- light bounce back at different angles when it hits a mirror or shiny metal.

For example :-when we put a spoon in a glass of water, the spoon it refract light and appears bent.

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3