Ray Optics and Optical Instruments

Question: Two thin lenses of focal lengths ${{f}_{1}}$ and ${{f}_{2}}$ are in contact and coaxial. The combination is equivalent to a single lens of power

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

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

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

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

Solution:

Explanation: No Explanation

Refraction at Curved Surface

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