Question

a student is unable to see clearly the words written on the blackboard placed at a distance of approximately 3 m from him name the defect of the vision the boy suffering from state the possible causes of this defect and explain the method method of correcting it

Answer 1

myopia
cause - elongation of eyeball, excess curvature of cornea
correction - use of concave lens of right power

Answer 2

Hi dear here is your answer

The boy who can't see written on the board is suffering from Myopia.

The causes which cause Myopia are

• Due to the high converging power of the eye lens.

• Due to Being Eye ball to long .

It can be corrected by using a concave lens .

Because concave lens reduces the high converfing power of lens because it is a diverging lens .

By using yhe concave lens the image is form on the Retina .

Hope it helps ☺

Thanks

#skystar