A man can see clearly up to 3 metres. Prescribes a lens for his spectacles so that he can see clearly up to `12 ` metres

A person can see clearly only up to 3 m.What type of defect a person have ? Prescribe a lens for his spectacles, so that he can see clearly up to 12 m.

A person can see things clearly upto 3m what is the power of lens he should use so that he can see upto 12 m ?

A person can see things clearly upto 3m what is the power of lens he should use so that he can see upto 12 m ?

A person can see clearly upto 2.5 m. Find the type and the power of lens that should be used so that he can see upto 10 m clearly.