If the light moving in a straight line bends by a small but fixed angle, it may be a case of
(a) reflection
(b) refraction
(c) diffraction
(d) dispersion
Choose the correct option:

1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. all of these

Subtopic:  Refraction at Plane Surface |
From NCERT
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Mark the correct options:

1. if the incident rays are converging, we have a real object.
2. if the final rays are converging, we have a real image.
3. the image of a virtual object is called a virtual image.
4. if the image is virtual, the corresponding object is called a virtual object.

Subtopic:  Reflection at Spherical Surface |
 74%
From NCERT
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Which of the following (referred to a spherical mirror) do (does) not depend on whether the rays are paraxial or not?
(a) pole
(b) focus
(c) radius of curvature
(d) principal axis
Choose the correct option:
1. (a) and (b)
2. (b) and (c)
3. (a), (b) and (c)
4. (a), (c) and (d)

Subtopic:  Reflection at Spherical Surface |
 66%
From NCERT
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The image of an extended object, placed perpendicular to the principal axis of a mirror, will be erect if

(a) the object and the image are both real

(b) the object and the image are both virtual

(c) the object is real but the image is virtual

(d) the object is virtual but the image is real

Choose the correct option:

1. (a) and (b)

2. (b) and (c)

3. (c) and (d)

4. (a) and (d)

Subtopic:  Reflection at Spherical Surface |
 50%
From NCERT
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A convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is painted black,

a. the image will be shifted downward
b. the image will be shifted upward
c. the image will not be shifted
d. the intensity of the image will decrease


Choose the correct option:

1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. all of these

Subtopic:  Lenses |
 87%
From NCERT
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Consider three converging lenses \(L_1,\) \(L_2\) and \(L_3\) having identical geometrical construction. The index of refraction of \(L_1\) and \(L_2\) are \(\mu\)1 and \(\mu\)2 respectively. The upper half of the lens \(L_3\) has a refractive index \(\mu\)1 and the lowest half has \(\mu\)2 (figure). A point object \(O\) is imaged at \(O_1\) by the lens \(L_1\) and at \(O_2\) by the lens \(L_2\) placed in same position. If \(L_3\) is placed at the same place,

      

a. there will be an image at \(O_1\)
b. there will be an image at \(O_2\)
c. the only image will form somewhere between \(O_1\) and \(O_2\)
d. the only image will form away from \(O_2\)

Choose the correct option:
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. all of these

Subtopic:  Refraction at Curved Surface |
 64%
From NCERT
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A screen is placed a distance 40 cm away from an illuminated object. A converging lens is placed between the source and the screen and it is attempted to form the image of the source on the screen. If no position could be found, the focal length of the lens

1. must be less than 10 cm

2. must be greater than 20 cm

3. must not be greater than 20 cm

4. must not be less than 10 cm

Subtopic:  Lenses |
 52%
From NCERT

Sorry!! currently, the explanation for the question is not provided. If you need further help, please email at support@neetprep.com with subject: Explanation Missing for Question Id: 306650

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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 |
 57%
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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