Physics
Grade-10
Easy
Question
A woman wears a pair of spectacles of power – 0.5. Which of the following statements is correct about her?
I. She is shortsighted.
II. She wears concave lenses.
III. The focal length of the lens of her spectacles is negative
IV. Her near point is farther than 25 cm from his eyes without lenses
- Only I, II and III are correct
- Only I, III and IV are correct
- All are correct
- Only III is incorrect
Hint:
In myopia the image forms before the retina.
The correct answer is: Only I, II and III are correct
The correct option is a) Only I, II and III are correct.
I. She is shortsighted.
II. She wears concave lenses.
III. The focal length of the lens of her spectacles is negative
A negative concave lens is required to the correct myopia or shortsightedness. In myopia the image forms in front of the retina. So, the concave lens further aparts the rays so that it meets on the retina.
The power of the lens is the reciprocal of focal length. This means if the focal length is negative, the power will also be negative.
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