What type of lens is used to correct long sightedness ?

Study the diagram given below and answer the questions which follow. The diagram is depicting a defect of the human eye. Name the type of lens used to correct short sightedness.

Which type of lens is used to correct astigmatisum ?

Name the type of lens used to correct eye defect.

Which of the following type of lens is used to correct the vision of a near sighted individual ?

Concave lens is employed to correct

The convex lens is used in-

Given below is a diagram depicting a defect of the human eye, study the same and then answer the questions that follow: (i) Name the defect shown in the diagram. (ii) What are the two possible reasons that cause this defect? (iii) Name the type of lens used to correct this defect. (iv) With the help of a diagram show how the defect shown above is rectified using a suitable lens.

The lens used for correcting myopia is.

Which type of lens has negative power ?

A person has near point at 100 cm. What power of lens is needed to read at 20 cm if he/she uses (a) contact lens, (b) spectacles having glasses 2.0 cm separated from the eyes?