MCQ
The equivalent resistance between $A$ and $B$ is


- A$\frac {8R}{5}$
- ✓$\frac {5R}{8}$
- C$\frac {3R}{8}$
- D$\frac {7R}{8}$


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Match the paths in List $I$ with conditions of refractive indices in List $II$ and select the correct answer using the codes given below the lists :
| List $I$ | List $II$ |
| $P$. $\quad e \rightarrow f$ | $1.$ $\quad \mu_1>\sqrt{2} \mu_2$ |
| $Q.$ $\quad e \rightarrow g$ | $2.$ $\quad \mu_1>\mu_1$ and $\mu_2>\mu_3$ |
| $R.$ $\quad e \rightarrow h$ | $3.$ $\quad \mu_1=\mu_2$ |
| $S.$ $\quad e \rightarrow i$ | $4.$ $\quad \mu_2<\mu_1<\sqrt{2} \mu_2$ and $\mu_2>\mu_3$ |
Codes: $\quad \quad P \quad Q \quad R \quad S $ 


