question_answer 7)

Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is 1 m. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is 25 cm.

Answer:

                The diagram to show the correction of hypermetropia is given here.                                Given: Near point distance for a hypermetropic eye, D = 100 cm                 Near point distance for a normal eye, D = 25 cm                  So,                                                          Using the lens formula,                 So, and