In order to obtain correct calculations for shading, what is the best length for normals of an object?

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Question:In order to obtain correct calculations for shading, what is the best length for normals of an object?

1.2

2.1 (unit length)

3.The length does not matter.

4.It is based on the size of the object being drawn.

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  1. In order to obtain correct calculations for shading, what is the best length for normals of an object?
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