Question

The effective focal length of two lenses in contact with each other, having focal lengths f1 and f2 is given by

Answer 1

The effective focal length of two lenses is $f=\dfrac{f_1f_2}{f_1+f_2}$

Explanation:

The effective focal length of two lenses in contact with each other is given by :

$\dfrac{1}{f}=\dfrac{1}{f_1}+\dfrac{1}{f_2}\\\\f=\dfrac{f_1f_2}{f_1+f_2}$

Here, f₁ and f₂ are focal length of the individual lens. Similarly, the power of the lens is given by :

$P=P_1+P_2$

Learn more,

Effective focal length

https://brainly.in/question/12870859