Ray Optics and Optical Instruments

Question: Which of the following is a correct relation

1) $_{a}{{\mu }_{r}}={{\,}_{a}}{{\mu }_{w}}\times \,{{\,}_{r}}{{\mu }_{\omega }}$

2) $_{a}{{\mu }_{r}}\times {{\,}_{r}}{{\mu }_{w}}={{\,}_{w}}{{\mu }_{a}}$

3) $_{a}{{\mu }_{r}}\times {{\,}_{r}}{{\mu }_{a}}=0$

4) $_{a}{{\mu }_{r}}/{{\,}_{w}}{{\mu }_{r}}={{\,}_{a}}{{\mu }_{w}}$

Solution:

Explanation: No Explanation

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