A person cannot see distincly any object placed beyond 40cm from his eye. The power of the lens which will enable him to see distant stars clearly is.

A person cannot see distincly any object placed beyond 40cm from his e

1.	A person cannot see distincly any object placed beyond 40cm from his eye. The power of the lens which will enable him to see distant stars clearly is.
Answer» <P> Solution :The person cannot see OBJECTS clearly beyond 0.4m, so his far point =0.4m DISTANCE of object=a He should use lens which forms image of distant object at a distance of 40 cm infront of it. `-1/0.40-1/-infty=1/f=p IMPLIES P=(-10)/4=-2.5D`