With fall in income, the demand for commodity decreases, in this sense the goods are normal as TV, refrigerator, cars etc.

In diagram, the demand falls from $\mathit{O}\mathit{Q}$ to $\mathit{O}{\mathit{Q}}_1$ , at the same price. It shift the demand curve towards left from $\mathit{D}\mathit{D}$ to ${\mathit{D}}_1{\mathit{D}}_1$ .