Homework Help: maths

Posted by Sabrina on Monday, August 27, 2012 at 12:36pm.

Can someone help please?

A circular opaque disk, 25 cm in diameter, is set up 30 cm from a circular source of light of diameter 40 cm. A screen is placed 30 cm beyond the opaque disk. Describe, giving dimensions, the nature of the shadow on the screen

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