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You need to use a 22-cm-focal-length lens to produce an inverted image twice the height of...

You need to use a 22-cm-focal-length lens to produce an inverted image twice the height of an object.

1. At what distance from the object should the lens be placed?

Express your answer to two significant figures and include the appropriate units.

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Answer #1

here given is hi = 2*ho

hi/ho = 2 = di/do

1/f = 1/di + 1/do

1/f = 1/2*do + 1/do

1/f = 3/2*(1/do)

do = (3/2)*22 = 33 cm

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