A photographic plate is directly in fornt of as small diffused source in the shape of a circular disc. It takes 12 s to get a go

A photographic plate is directly in fornt of as small diffused source in the shape of a circular disc. It takes 12 s to get a good exposure. If the source is rotated by `60^@` about one of its diameters, the time needed to get the same exposure will be
A. 6s
B. 12s
C. 24s
D. 48

A photographic plate is directly in fornt of as small diffused source in the shape of a circular disc. It takes 12 s to get a good exposure. If the so

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