Physics JAMB

The sharpness of the boundary of the shadow of an object is determined by the?

A. intensity of light striking the object
B. rays of light passing through the object
C. nature of the object
D. opacity of the object

Correct Answer:

Option B = rays of light passing through the object

Explanation

The sharpness of the boundary of the shadow of an object is determined by the rays of light passing through the object. The smaller the rays passing through, that is from a point source, the sharper the shadow becomes, but the more the rays, that are rays from a large source, the more blurred the shadow becomes.

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