In the figure shown here, what is the equivalent focal length of the combination of lenses (Assume that all la

Question

In the figure shown here, what is the equivalent focal length of the combination of lenses (Assume that all layers are thin)? $n_1 = 1.5$, $n_2 = 1.6$, $R_1 = R_2 = 20$ cm

Accepted Answer

The system consists of two plano-convex lenses and one biconvex lens. The equivalent power $P = P_1 + P_2 + P_3$. Using the lens maker's formula $\frac{1}{f} = (n-1)(\frac{1}{R_1} - \frac{1}{R_2})$, the calculation leads to $f = -100$ cm.

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