Question

Question Type : Multiple Choice
Question No. 3
Two thin convex lenses of focal length f and 2f are in
contact and coaxial, the power of the combination is
​

Answer 1

➡️ p = 1/F1 + 1/F2

is correct answer ❤️

Answer 2

If two thin lenses of focal lengths` f_(1)` and `f_(2)` are placed in contact coaxially, then equivalent focal length of combination is <br> `(1)/(F)=(1)/(f_(1)) + (1)/(f_(2))+(0)/(f_(1)f_(2))=(1)/(f_(1))+(1)/(f_(2))` <br> Power for the combination is <br> `P=(1)/(F)=(1)/(f_(1))+(1)/(f_(2))=(f_(1)+f_(2))/(f_(1)f_(2))`

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