Physics
Grade-10
Easy
Question
A man wears a pair of spectacles of power +3.5. Which of the following statements is correct about him?
I. He is farsighted.
II. He wears concave lenses
III. The focal length of the lens of his spectacles is positive
IV. His near point is farther than 25 cm from his eyes without lenses
- Only I, III and IV are correct
- All are correct
- Only III and IV are correct
- Only I and IV are correct
Hint:
The person has a vision problem in which he can see distant objects clearly.
The correct answer is: Only I, III and IV are correct
The correct option has a) Only I, III and IV are correct.
I. He is farsighted.
III. The focal length of the lens of his spectacles is positive
IV. His near point is farther than 25 cm from his eyes without lenses
The power of the lens is positive, so it is a convex lens. A convex lens is used to correct hypermetropia or farsightedness. Wearing a convex lens of suitable power helps the eye to have the near point at 25cm.
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