Since the image of object formed in front of the retina , the defect of an eye is short sighted ness myopia.
To correct such defect , we use concave lens , and the corrected ray diagram is as given below.
here , the f = -5-0 cm
= -0.5 m
power of lens p = ?
by the formula,
p = 1/f
p = 1/-0.5
p = -2 D