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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