with a biconcave mirror of ambit of curvature 36cm.what is the position of the object?
2)Find the position of an article which if placed in foreground of a biconcave mirror of focal breadth 20 cm produces a basic angel which is alert the admeasurement of the object.

if you yield a section of cardboard that is .01 inches blubbery and bend it in bisected 20 times, how thich will the bankrupt cardboard be?

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