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 |
 54%
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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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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In which of the following the final image is erect?

(a) Simple microscope

(b) Compound microscope

(c) Astronomical telescope

(d) Galilean telescope

Choose the correct option:

1. (a) and (b)

2. (b) and (c)

3. (c) and (d)

4. (a) and (d)

Subtopic:  Simple & Compound Microscope |
 50%
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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Mark the correct options.

(a) If the far point goes ahead, the power of the divergent lens should be reduced

(b) If the near point goes ahead, the power of the convergent lens should be reduced

(c) If the far point is 1m away from the eye, divergent lens should be used

(d) If the near point is 1m away from the eye, divergent lens should be used

1. (a) and (b)

2. (b) and (c)

3. (a) and (c)

4. (c) and (d)

Subtopic:  Human Eye |
From NCERT

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The focal length of the objective of a compound microscope is f0 and its distance from the eyepiece is L. The object is placed at a distance u from the objective. For proper working of the instrument,

(a) L < u

(b) L > u

(c) f0 < L < 2f0

(d) L > 2f0

Choose the correct option:

1. (a) and (b)

2. (b) and (d)

3. (b) and (c)

4. (c) and (d)

Subtopic:  Simple & Compound Microscope |
From NCERT

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The angular dispersion produced by a prism

1. increases if the average refractive index increases

2. increases if the average refractive index decreases

3. remains constant whether the average refractive index increases or decreases

4. has no relation with average refractive index

Subtopic:  Prisms |
 53%
From NCERT

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