The ray diagram for two lenses kept at some d | vedclass

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(C) For parallel rays incident on the first lens $(I)$,the rays converge at its focus,which is at a distance $f_1$ from the optical center $O_1$.For t

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$f_1 + f_2 = d$

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(C) For parallel rays incident on the first lens $(I)$,the rays converge at its focus,which is at a distance $f_1$ from the optical center $O_1$.For the final emergent rays to be parallel to the principal axis,the point of convergence (which acts as an object for the second lens $II$) must be at the focal point of the second lens. This means the distance of this point from the optical center $O_2$ must be $f_2$.Since the point of convergence is at distance $f_1$ from $O_1$ and at distance $f_2$ from $O_2$,the total distance $d$ between the two lenses is the sum of these two focal lengths.Therefore,$d = f_1 + f_2$.

The ray diagram for two lenses kept at some distance is given in the figure. Which of the following options is correct? ($f_1, f_2 =$ focal lengths,$d =$ distance between lenses)

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