What type of lens is used for correction of defect in case of Myopia?

The lens used for correcting myopia is.

Concave lens is employed to correct

Which type of lens is used to prevent myopia vision?

What are the types of lens?

Which type of lens is used as magnifying glass?

What type of chemicals are used to control rats?

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 short sighted person can see objects at 20cm from his eyes. What type of lens is to be used to see clearly objects at 100cm away?

(i) What type of non stichiometirc point defect is responsible for the pink colour of LiCI? (ii)What type of stochiometric defects is shown by NaCI?