Question

Nupur needs Alliance of power minus 4.5 diopter for correction of her vision.(a)what kind of defect in vision is she is suffering from. (b)what is the focal length and nature of the corrective lens. (c)draw a diagram showing the defected I and correction for this defect. (d) what are the causes of this defect

Answer 1

P= -4.5diopter

(a)what kind of defect in vision is she is suffering from :
The person is suffering from Myopia where he can see near distance clearly but finds difficulty in seeing distant objects.

(b)what is the focal length and nature of the corrective lens:
We know that P=1/f
P= - 1/4.5
=-0.222m
=-22.2cm
 so minus sign indicates it is concave lens .

c]draw a diagram showing the defec and correction for this defect. :
Please refer the attachment.

d]what are the causes of this defect Myopia:
Causes are :
--> Elongated eye ball
--->  Greater focal length.