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A Converging Lens of Focal Length 20 Cm Is Placed

Question 8

Multiple Choice

A converging lens of focal length 20 cm is placed in contact with a diverging lens of focal length 30 cm.The focal length of this combination is:

A) +60 cm
B) +25 cm
C) +12 cm
D) +10 cm
E) -10 cm

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