[" A far sighted person cannot focus "],[" distinctly on objects closer than "1m" ."],[" What is the power of lens that will permit "],[" him to read from a distance of "40cm?]

A person cannot see distinctly any object placed beyond 40cm from his eye. Find the power of lens whicTFwill enable him to see distant stars clearly is?.

A short-sighted person can see distinctly the object situated at a distance of 20 cm from him. What type of lens will he use to see the objects situated at a distance of 100 cm from him ? What will be the power of the lens ?

A farsighted person cannot see objects placed closer to 50 cm. Find the power of the lens needed to see the objects at 20 cm.

A farsighted person cannot see objects placed closer to 50 cm. Find the power of the lens needed to see the objects at 20 cm.

A farsighted person cannot see objects placed closer to 50 cm. Find the power of the lens needed to see the objects at 20 cm.