# The distance between the object and its real image formed by a concave mirror is minimum when the distance of the object from the centre of curvature of the mirror is: [f $\to$ focal length of the mirror] 1.  Zero 2.  $\frac{\mathrm{f}}{2}$ 3.  f 4.  2f

Subtopic:  Reflection at Spherical Surface |
From NCERT
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Two slabs P & Q of transparent materials have a thickness in the ratio 2 : 5. If a ray of light takes the same amount of time to move from A to B and B to C, then the refractive index of Q with respect to P will be:

1. 0.4

2. 2.5

3. 1.4

4. 1.85

Subtopic:  Refraction at Plane Surface |
63%
From NCERT
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In the following diagram, what is the distance x if the radius of curvature is R = 15 cm?

1. 30 cm

2. 20 cm

3. 15 cm

4. 10 cm

Subtopic:  Refraction at Curved Surface |
78%
From NCERT
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In the diagram shown below, the image of the point object O is formed at $$l$$ by the convex lens of focal length 20 cm, where $$F_1$$ and $$F_2$$ are foci of the lens. The value of $$x'$$ is:

 1 10 cm 2 20 cm 3 30 cm 4 40 cm
Subtopic:  Lenses |
72%
From NCERT
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If the space between two convex lenses of glass in the combination shown in the figure below is filled with water, then:

 1 the focal length of the system will decrease. 2 the focal length of the system will increase. 3 the power of the system will increase. 4 the power of the system will become infinite.

Subtopic:  Lenses |
62%
From NCERT
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Focal lengths of objective and eyepiece of a compound microscope are 2 cm and 6.25 cm respectively. An object AB is placed at a distance of 2.5 cm from the objective which forms the image A'B' as shown in the figure. Maximum magnifying power in this case, will be:

 1 10 2 20 3 5 4 25
Subtopic:  Simple & Compound Microscope |
68%
From NCERT
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A concave lens of focal length 25 cm produces an image $\frac{1}{10}\mathrm{th}$ the size of the object. The distance of the object from the lens is:

1. 225 cm

2. 250 cm

3. 150 cm

4. 175 cm

Subtopic:  Lenses |
82%
From NCERT
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A mark on the surface of sphere (µ = 3/2) is viewed from a diametrically opposite position. It appears to be at a distance $$15~\mathrm{cm}$$ from its actual position. The radius of sphere is:
1. 15 cm
2. 5 cm
3. 7.5 cm
4. 2.5 cm

Subtopic:  Refraction at Curved Surface |
53%
From NCERT
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Choose the correct mirror image of the figure:

 1 2 3 4
Subtopic:  Reflection at Plane Surface |
77%
From NCERT
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A lens forms an image of a point object placed at distance 20 cm from it. The image is formed just in front of the object at a distance 4 cm from the object (and towards the lens). The power of the lens is:

1.  $-$2.25 D

2.  1.75 D

3.  $-$1.25 D

4.  1.4 D

Subtopic:  Lenses |
77%
From NCERT
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