Question

Assertion (A): The defect of eye called myopia is caused due to the short focal length of eye-lens or due to eye-ball being too long.

Reason (R): Myopia is corrected by using spectacles containing diverging lenses (which decrease the converging power of the eye-lens).

Options

• Both A and R are true and R is correct explanation of the assertion.

• Both A and R are true but R is not the correct explanation of the assertion.

• A is true but R is false.

• A is false but R is true.

Answer 1

Both A and R are true but R is not the correct explanation of the assertion.

Explanation:

The assertion is true because myopia (nearsightedness) arises when an overly elongated eyeball or a highly curved eye lens creates an excessively short focal length, causing light rays to focus in front of the retina. This is also true because concave (diverging) lenses effectively neutralise this excess converging power, shifting the focus back onto the retina. However, this explains only how the defect is clinically corrected, not the physiological causes detailed in the assertion.