A student is not capable of focusing on objects closer than 0.60m from the eyes

Question

A student is not capable of focusing on objects closer than 0.60m from the eyes and no farther than 1.10m from them. To improve the vision, separate prescriptions are needed, one to correct for myopia, and the other to correct for hyperopia. To be able to see objects that are 0.25m away from the eye, we need to glue another lens at the bottom portion of this lens. What power lens should we glue to the lens you have determined in part c, to enable the student to see objects that are 0.25m away from the eye? Express your answer in diopters.

Explanation / Answer

Here question is not complete,partC is not mentioned

The range of the object to be kept is between 0.60m and 1.10m from the eyes.

Inorder to see objects that are 0.25m away from the eye, we have to correct Hyperopia or hypermetropia.

It can be corrected with convex lenses in eyeglasses or contact lenses. Convex lenses have a positive dioptric value, which causes the light to focus closer than its normal range.

Here, Take di= 0.25 m and d0= 0.60m

1/f= 1/di+1/d0

1/f= 1/0.25+1/0.60= 5.6667

f= 0.176 m

p= 1/f= 5.667 dioptre

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