two thin lenses of focal lengths + 20 cm and -15 CM are kept in contact what is the focal length and power of the combination
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Answered by
83
First focal length is +20 cm
Therefore, power =1/20cm
=1/0.2 m
=+5D
Again, F2 is -15 cm
Therefore, power =1/-15 cm
=1/-0.15 m
=-6.6D
Thus, power = 5-6.6
= -1. 6 D
Now, we know that,
F =1/P
=1/-1.6
=-0.625 m
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Answer:refer the attachment
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