Answer:
As the focal length is negative, the lens used is concave. The boy is suffering from myopia. Here, \[f=-50cm=-0.50m\] \[\therefore \] Power, \[P=\frac{1}{f(\text{in m})}=\frac{1}{-0.50}=\mathbf{-2D}\].
You need to login to perform this action.
You will be redirected in
3 sec