Question

Noopur need as lens of power _4.5D for correction of her vision .what kind of defect in vision is suffering from?what is focal length and nature of the correction lens .draw ray diagram showing defective eye ,correction for this defect . What are the causes of this defect

Answer 1

he is suffering from myopia.



given power.., p=-4.5D


we have

p=1/f

so f=1/p. m
f=1/-4.5
f= - 1/4.5m

f=-1/45/10
f=-10/45
f=-2/9
f=- - 0.2222222.......
f= - 0.23m
f= - 23cm


due to the sign of ➖ in focal length the lens would be concave lens