Choose the correct mirror image of the figure:
    

1. 2.
3. 4.

Subtopic:  Reflection at Plane Surface |
 77%
From NCERT
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An air bubble in a glass slab with refractive index 1.5 (near-normal incidence) is 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The thickness (in cm) of the slab is:

1. 8 2. 10
3. 12 4. 16
Subtopic:  Refraction at Plane Surface |
 74%
From NCERT
NEET - 2016
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If the focal length of the objective lens is increased, then magnifying power of:

1. microscope will increase but that of telescope decrease
2. microscope and telescope both will increase
3. microscope and telescope both will decrease
4. microscope will decrease but that of the telescope will increase
Subtopic:  Simple & Compound Microscope |
 67%
From NCERT
AIPMT - 2014
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A concave mirror gives an image three times as large as the object placed at a distance of 20 cm from it. For the image to be real, the focal length should be:

1. 10 cm 2. 15 cm
3. 20 cm 4. 30 cm
Subtopic:  Reflection at Spherical Surface |
 61%
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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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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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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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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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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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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