Question

A converging lens of focal length 30 cm is placed
in contact with another converging lens of unknown
focal length, then possible value for focal length of
combination is
(1) 15 cm
(2) 60 cm
(3) 36 cm
(4) -12 cm​

Answer 1

Answer:

15 ; option 1

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Answer 2

Answer:

2.60cm. hope it's help you and Mark me as brainliest