Question Bank - General Science

Here's the question bank on all the general science topics.

Which of the given figures shows the condition in a hypermetropic eye?

A.
Figure A
B.
Neither figure A nor figure B
C.
Figure B
D.
Figure A and B both

Solution:

The correct answer is Figure B.Concept:Hypermetropia:It is also known as far-sightedness.A person with hypermetropia can see faraway objects clearly but cannot see nearby objects clearly.Explanation:Cause of hypermetropia:Due to weakening of the ciliary muscles and/or the decreased flexibility of the lens.The focal length of the eye lens is too long.The eyeball has become too small. ?The image of a distant object is formed behind the retina and not on the retina.The defect is corrected by using convex lenses.Additional InformationMyopia (Near-sightedness):A person with Myopia can see nearby objects clearly.A person with myopia cannot see faraway objects clearly.The far point for the myopic eye is nearer than infinity.Cause:Excessive curvature of the eye lensElongation of eyeballThe image of a distant object is formed in front of the retina and not on the retina.Defected is corrected by using Concave lenses such that the lens will bring the image back onto the retina.Presbyopia:The power of accommodation of the eye usually decreases with ageing.The ciliary muscles weaken and thereby the flexibility of the eye lens reduces.The near point moves away.Spectacles with convex lenses are recommended.

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