Question

THE FAR POINT DISTANCE OF OF A SHORT SIGHTED PERSON IS 1.5 M , FIND THE FOCAL LENGTH , POWER AND NATURE OF TH LENSES NEEDED

Answer 1

f=-d
f=-1.5m
P=1/-1.5=-0.67D
As power negative......so concave lens

Answer 2

Focal length = -d
= -1.5m
Power = 1/-1.5
= -0.6666666667
The nature of lenses is concave.
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