When the power of eye lens increases, the defect of vision is produced. The defect is known as

What are refractive defects of vision ? Why these defects arise ?

Rahul's doctor told him that length of his eyeball is increased i.e. distance of retina from the eye lens has increased. Identify the defect of vision Rahul has, and suggest a correction of his defect with the help of diagram.

Which type of defect of vision is rectified a convex lens?

Name the type of lens used to correct eye defect.