If a light ray is incident normally on face AB of a prism, then for no emergent ray from second face AC:
[μrefractive index of glass of prism]

   

1. \(\mu=\frac{2}{\sqrt{3}}\) 2. \(\mu>\frac{2}{\sqrt{3}}\)
3. \(\mu<\frac{2}{\sqrt{3}}\) 4. μ can have any value.

Subtopic:  Prisms |
 72%
From NCERT
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In a glass (μ = 1.5) sphere with a radius of 10 cm, there is an air bubble B at a distance of 5 cm from C. The distance of the bubble from the surface of the sphere (i.e., point A) as observed from point P in the air will be:

   

1. 4.5 cm 2. 20.0cm 
3. 9.37 cm  4. 6.67 cm
Subtopic:  Refraction at Curved Surface |
 57%
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 |
 76%
From NCERT
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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 |
 68%
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 |
 62%
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 |
 71%
From NCERT
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