The muscles of a normal eye are least strained when the eye is focused on an object

1. far away from the eye

2. very close to the eye

3. at about 25 cm from the eye

4. at about 1 m from the eye

Subtopic:  Human Eye |
 56%
From NCERT
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A normal eye is not able to see objects closer than \(25~\text{cm}\) because:

1. the focal length of the eye is \(25~\text{cm}.\)
2. the distance of the retina from the eye lens is \(25~\text{cm}.\)
3. the eye is not able to decrease the distance between the eye lens and the retina beyond a limit.
4. the eye is not able to decrease the focal length beyond a limit.

Subtopic:  Human Eye |
 51%
From NCERT
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When objects at different distances are seen by the eye, which of the following remain constant?

1. The focal length of the eye-lens

2. The object-distance from the eye-lens

3. The radii of curvature of the eye-lens

4. The image-distance from the eye-lens

Subtopic:  Human Eye |
From NCERT
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A person A can clearly see objects between 25 cm and 200 cm. Which of the following may represent the range of clear vision for a person B having muscles stronger than A, but all other parameters of eye identical to that of A?

1. 25 cm to 200 cm

2. 18 cm to 200 cm

3. 25 cm to 300 cm

4. 18 cm to 300 cm

Subtopic:  Human Eye |
From NCERT
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The focal length of a normal eye-lens is about

1. 1 mm

2. 2 cm

3. 25 cm

4. 1 m

Subtopic:  Human Eye |
From NCERT
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The distance of the eye-lens from the retina is x. For a normal eye, the maximum focal length of the eye-lens

1. = x

2. < x

3. > x

4. = 2x

Subtopic:  Human Eye |
 53%
From NCERT
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A man wearing glasses of focal length +1m cannot clearly see beyond 1 m

1. if he is farsighted

2. if he is nearsighted

3. if his vision is normal

4. in each of these cases

Subtopic:  Human Eye |
From NCERT
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An object is placed at a distance u from a simple microscope of focal length f. The angular magnification obtained depends

1. on f but not on u

2. on u but not on f

3. on f as well as u

4. neither on f nor on u

Subtopic:  Simple & Compound Microscope |
 53%
From NCERT
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To increase the angular magnification of a simple microscope, one should increase:

1. the focal length of the lens
2. the power of the lens
3. the aperture of the lens
4. the object size
Subtopic:  Simple & Compound Microscope |
 55%
From NCERT
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A man is looking at a small object placed at his near point. Without alternating the position of his eye or the object, he puts a simple microscope of magnifying power 5X before his eyes. The angular magnification achieved is

1. 5

2. 2.5

3. 1

4. 0.2

Subtopic:  Simple & Compound Microscope |
From NCERT

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