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Q.

Three lenses in contact have a combined focal length of 12 cm. When the third lens is removed, the combined focal length is 607 cm. The third lens is

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a

A converging lens of focal length 30 cm

b

A converging lens of focal elngth 60 cm

c

A diverging lens of focal length 30 cm

d

A diverging lens of focal length 60 cm

answer is C.

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Detailed Solution

1f=1f1+1f2+1f3;f=2 cm;1f1+1f2=1607
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