1.

A concave lens of focal length 40 cm and a concave lens of 50 cm are placed in contact find the focal length of the combination

Answer»

ANSWER:

-22.23

Explanation:

f1=-40cm

f2=-50cm

1/ F= -1/f1-1/f2

-1/40-1/50

=-9/200

F=-200/9=-22.23



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