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  focal length of the mirror]
1.  Zero
2.  f2
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 110th 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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