Question: A 2.0 mW laser pointer has a beam diameter of 1.5 mm. When it is accidentally pointed at a persons eye, the beam is focused

A 2.0 mW laser pointer has a beam diameter of 1.5 mm. When it is accidentally pointed at a person’s eye, the beam is focused to a spot of diameter 20.0 μm on the retina and the retina is exposed for 80 ms.

(a) What is the intensity of the laser beam?

(b) What is the intensity of light incident on the retina?

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