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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A point object O is placed at a distance 20 cm from a biconvex lens of the radius of curvature 20 cm and \(\mu=1.5.\) The final image produced by lens and mirror combination will be at:

         

1. 10 cm from the mirror
2. 20 cm from the lens
3. - 20 cm from the lens
4. -15 cm from the mirror

Subtopic:  Lenses |
 52%
From NCERT
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A person can see objects clearly between 1 m and 3 m. The power of lens required to correct near point will be:

1.  -2.5 D

2.  + 3 D

3.  + 1.5 D

4.  -1.75 D

Subtopic:  Human Eye |
 67%
From NCERT
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In the case of a compound microscope, the image formed by the objective lens is:

1. Virtual, erect, and diminished.
2. Real, erect, and magnified.
3. Virtual, inverted, and enlarged. 
4. Real, inverted, and enlarged.

Subtopic:  Simple & Compound Microscope |
 71%
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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A glass slab is placed with the right-angled prism as shown in the figure. The possible value of \(\theta\) such that light incident normally on the prism does not pass through the glass slab is:

   

1. \(30^\circ\) 2. \(37^\circ\)
3. \(45^\circ\) 4. Both (1) & (2)

Subtopic:  Total Internal Reflection |
From NCERT
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A graph is plotted between the angle of deviation \(\delta\) in a triangular prism and the angle of incidence as shown in the figure. Refracting angle of the prism is:

        

1. \(28^\circ~\) 2. \(48^\circ~\)
3. \(36^\circ~\) 4. \(46^\circ~\)
Subtopic:  Prisms |
 73%
From NCERT
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Three identical thin convex lenses are kept as shown in the figure. A ray passing through the lens is shown. The focal length of each lens is:

1. 5 cm 2. 10 cm
3. 15 cm 4. 20 cm
Subtopic:  Lenses |
 53%
From NCERT
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