Ray Optics and Optical Instruments

Question: The length of the optical path of two media in contact of length ${{d}_{1}}$ and ${{d}_{2}}$ of refractive indices $$${{\mu }_{1}}$ and ${{\mu }_{2}}$ respectively, is

1) ${{\mu }_{1}}{{d}_{1}}+{{\mu }_{2}}{{d}_{2}}$

2) ${{\mu }_{1}}{{d}_{2}}+{{\mu }_{2}}{{d}_{1}}$

3) $\frac{{{d}_{1}}{{d}_{2}}}{{{\mu }_{1}}{{\mu }_{2}}}$

4) $\frac{{{d}_{1}}+{{d}_{2}}}{{{\mu }_{1}}{{\mu }_{2}}}$

Solution:

Explanation: No Explanation

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