Physics
Grade-10
Easy
Question
A human eye can see clearly from ____ to ______.
- 25 cm to infinity
- 20 cm to 25 cm
- 25 cm to 100 cm
- 0 cm to 100 cm
Hint:
The normal point of the eye is the distance in which the eyes can see objects without strain.
The correct answer is: 25 cm to infinity
The human eye can see objects clearly without eye strain if the object is at least 25 cm away. This 25 cm distance of his is called the near point of the eye. When an object is at infinity from 25 cm, a clear and sharp image of the object is formed on the retina and interpreted sharply.
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- Myopia means that the focus of the eye is in front of the retina instead of on it. The retina is the surface at the back of the eye that collects light.
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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
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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
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