Invert sugar, is
Hydrolysis of sucrose (optical rotation +66.5°) will produce one molecule of glucose (+52.5°) and one molecule of fructose (–92°).
Therefore, the products will change the dextrorotation to levorotation, or the plane of rotation is inverted. Equimolecular mixture of glucose and fructose thus formed is called invert sugar. The enzyme producing hydrolysis of sucrose is called sucrase or invertase.
Honey contains invert sugar. Invert sugar is sweeter than sucrose.
Reference: Vasudevan 7th  ed, pg 77
equimolar mixture of glucose and fructose
equimolar mixture of Sucrose and glucose
equimolar mixture of Glucose and lactose
equimolar mixture of Glucose and lactose