Question

Shruti from Std. X uses spectacles. The power on the lenses in
her spectacles is -3.0 D. W
Answer the following questions
State the type of lens used in her spectacles,
b. Name the defect of vision Shruti is suffering from
Find the focal length of the lenses used in her
spectacles​

Answer 1

Answer:

the power is given in negative so it is a convex lens by the property of sign convection

she was suffering from farsightness in which she cant see the nearer objects clearly

Answer 2

Answer:

a)Concave lens is used in her spectacles.

b)She is suffering from myopia/nearsightedness

c) P=-0.3

solution:P=1/f

f=1/p

f=1/-3

p=-0.34