Question

Sapna, a 15 years old girl found that her father was
not able to read the newspaper comfortably though
he was able to see the distant objects clearly. This
defect is common with the ageing. His father colud
not know the reason but Sapna knew about the
reason. She asked her father to check up the eyes
to a doctor. The doctor prescribed to use a lens of
+1.5 D. Name the defect of vision, its causes and
how this can be corrected? Draw ray-diagram for
its correction.​

Answer 1

Answer:

The disease her father is suffering from is hypermetropi or far sightedness. In this disease a person is not able able to view near object clearly but can see distant object distinctly.

This defect in vision can be corrected by using a convex lens of appropriate power.

The convex lens converges the light rays that intersect beyond the retina to intersect on the retina and form the image.

Hope it helps..

✌

Answer 2

CONVEX LENS

HYPERMETROPIA

CAUSES:- DECREASE IN CONVERGING POWER.

CORRECTED :- APPLYING CONCAVE LENS OF SUITABLE POWER ( +1.5D AS MENTIONED).

HOPE IT HELPS

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