Physics, asked by Smritishaktawat, 1 year ago

Two thin lenses, one of focal length +60 cm and other of focal length -20 cm are put in contact . The combined focal length is ?

Answers

Answered by Rahul1905

15

1/ fe = 1/f1 + 1/f2
1/ fe = 1/60 - 1/20
= (1 - 3)/60
fe = -30 cm ANSWER.
thanks...

Smritishaktawat: Thanks

Rahul1905: your welcome smriti

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