What is the focal length of combination of a convex lens of focal lenghth 30cm?
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Focal length of convex lens is positive
Therefore the focal length of the combination
=30+30 cm=60 cm
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F1=30 cm , F2=30 cm and F=?.
1/F=1/F1 +1/F2
1/F= 1/30 + 1/30
1/F=1+1/30
1/F=2/30
1/F=1/15
F=15 cm
this is right bro please mark me as brain list please
1/F=1/F1 +1/F2
1/F= 1/30 + 1/30
1/F=1+1/30
1/F=2/30
1/F=1/15
F=15 cm
this is right bro please mark me as brain list please
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