The size of an object as perceived by an eye depends primarily on

1. actual size of the object

2. distance of the object from the eye

3. aperture of the pupil

4. size of the image formed on the retina

Subtopic:  Human Eye |
From NCERT
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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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When we see an object, the image formed on the retina is

(a) real

(b) virtual

(c) erect

(d) inverted

Choose the correct option:

1. (a) and (b)

2. (b) and (c)

3. (c) and (d)

4. (a) and (d)

Subtopic:  Human Eye |
 74%
From NCERT

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The maximum focal length of the eye-lens of a person is greater than its distance from the retina. The eye is

1. always strained in looking at an object

2. strained for objects at larger distances only

3. strained for objects at short distances only

4. unstrained for all distances

Subtopic:  Human Eye |
From NCERT

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