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please explain in detail two concave lens each of focal length 30 cm are placed in contact with each other find the power of combination​

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gurpreet33

gurpreet33

15.02.2018

Physics

Secondary School

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2 concave lens each of focal length 30cm are placed in contact .what is focal length of the compound lens

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TwilightQueenBee

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Heya,

According to the question,

Focal length of two Concave lens = -30cm

We calculate the effective focal length by the formula,

1/F = 1/f1 + 1/f2

f1 = -30

f2 = -30

1/F = -1/30 - 1/30

1/F = -2/30

1/F = -1/15

F = -15

So, the focal length of the compound lens = -15cm

Hope this helps....:)