A) \[20cm\]
B) \[10cm\]
C) \[40cm\]
D) \[5cm\]
Correct Answer: C
Solution :
For fig. (i) \[\frac{1}{20}=(\mu -1)\left( \frac{1}{R}-\frac{1}{R} \right)\] ?..(i) For fig. (ii) \[\frac{1}{F}=(\mu -1)\,\left( \frac{1}{R}-\frac{1}{\infty } \right)\] ?..(ii) From the equations (i) and (ii) we get \[F=40\,cm\]You need to login to perform this action.
You will be redirected in
3 sec