The correct option is Both A and R are true and R is the correct explanation of A
Explanation
Hypermetropia, also known as far-sightedness, is a common refractive defect of vision. In this condition, the eye can see distant objects clearly, but the near point recedes beyond the normal distance of 25 cm, causing difficulty in focusing on nearby objects.
Analysis of Assertion and Reason
- Assertion (A): Correct. A person suffering from hypermetropia cannot see nearby objects clearly. This is because their near point is farther away than the normal near point (25 cm), requiring them to hold reading material at a distance to see it sharply.
- Reason (R): Correct. The optical cause of hypermetropia is that the eyeball is too short or the focal length of the eye lens is too large. Consequently, light rays diverging from a nearby object are not converged sufficiently by the eye lens to focus on the retina. Instead, they converge to form an image at a point behind the retina.
- Justification: The inability to see nearby objects clearly (Assertion) is the direct physical result of the image forming behind the retina (Reason). Therefore, R is the correct explanation of A.
Key Takeaway:
In Hypermetropia (far-sightedness), the image of a nearby object is formed behind the retina. This defect is corrected using a convex (converging) lens, which increases the converging power of the eye system.