A) 2 m
B) 4 cm
C) 16 cm
D) 32 cm
Correct Answer: D
Solution :
Let focal length becomes \[{{f}_{w}}\]on inserting the lens in water, then using relation \[\frac{{{f}_{w}}}{{{f}_{a}}}=\frac{({{\mu }_{g}}-1)}{\left( \frac{{{\mu }_{g}}}{{{\mu }_{w}}}-1 \right)}\] or \[\frac{{{f}_{w}}}{8}=\frac{(1.5-1)}{\left( \frac{1.5}{4/3}-1 \right)}\] Hence, \[{{f}_{w}}=32\,cm\]You need to login to perform this action.
You will be redirected in
3 sec