Physics

Physics

Problem

A converging lens has a focal length of

+20\,\text{cm}

. An object is placed

60\,\text{cm}

in front of the lens. What is the image distance

s_i

? a)

15\,\text{cm}

b)

30\,\text{cm}

c)

-30\,\text{cm}

d)

20\,\text{cm}

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