Ray Optics and Optical Instruments

Question: Two thin lenses of focal lengths $f_1$ and $f_2$ are in contact. The focal length of this combination is

1) $\frac{{{f}_{1}}{{f}_{2}}}{{{f}_{1}}-{{f}_{2}}}$

2) $\frac{{{f}_{1}}{{f}_{2}}}{{{f}_{1}}+{{f}_{2}}}$

3) $\frac{2{{f}_{1}}{{f}_{2}}}{{{f}_{1}}-{{f}_{2}}}$

4) $\frac{2{{f}_{1}}{{f}_{2}}}{{{f}_{1}}+{{f}_{2}}}$

Solution:

Explanation: No Explanation

Refraction at Curved Surface

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