A lens of focal length 20.0 cm and apert...

A lens of focal length 20.0 cm and aperture radius 2.0cm is placed at a distance 30.cm from a point source of light. On the other side a screen is placed at a distance 50.0cm from the lens. The radius of spot of light formed on screen is (neglect spherical abberation through lens)

A

0.5 cm

B

0.3cm

C

0.2cm

D

1.0cm

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