Question

A person cannot see the objects distinctly when placed at a distance less than 50 cm identify the defect of vision give two reasons for this defect calculate the power and nature of this lense he sould se using too see clearly the object placed at that distance of 25 cm from his eyes

Answer 1

Hey dear,

● Answer -
A) Name of the defect => Hypermetropia
Hypermetropia is a condition of the eye where close objects appear blurry but far ones appear clearly.

B) Causes of hypermetropia -
1) Increased focal length
2) Shortening of eyeball
3) Decreased refractive index

C) Hypermetropia is managed with providing patients with convex lens (positive lens).
P = 1/v - 1/u
P = 1/-0.5 - 1/-0.25
P = +2 D

Nature of the image formed => Real, inverted & zoomed image

Hope this helped you...