An air bubble in a sphere having 4 cm diameter that appears 1 cm from the surface nearest to the eye when looked along diameter. Ifμga = 1.5, the distance of bubble from the refracting surface is

1.  1.2 cm                   

2.  3.2 cm

3.  2.8 cm           

4.  1.6 cm

Subtopic:  Refraction at Curved Surface |
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An observer can see through a pinhole the top end of a thin rod of height h, placed as shown in the figure. The beaker height is 3h and its radius h. When the beaker is filled with a liquid up to a height 2h, he can see the lower end of the rod. Then the refractive index of the liquid is

                        

(1) 5/2                                   

(2) 5/2

(3) 3/2                               

(4) 3/2

Subtopic:  Refraction at Plane Surface |
 62%
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In an experiment of find the focal length of a concave mirror a graph is drawn between the magnitudes of u and v.  The graph looks like

1. 2.
3. 4.

          

Subtopic:  Reflection at Spherical Surface |
 64%
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As the position of an object \((u)\) reflected from a concave mirror is varied, the position of the image \((v)\) also varies. By letting the \(u\) change from \(0\) to infinity, the graph between \(v\) versus \(u\) will be:

1. 2.
3. 4.

Subtopic:  Reflection at Spherical Surface |
 67%
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The graph between \(u\) and \(v\) for a convex mirror is:
1. 2.
3. 4.
Subtopic:  Reflection at Spherical Surface |
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A glass prism μ=1.5 is dipped in water μ=4/3 as shown in figure. A light ray is incident normally on the surface AB. It reaches the surface BC after totally reflected, if

                  

(a) sinθ  89                            (b) 23<sinθ < 89

(c) sin θ  23                            (d) It is not possible

Subtopic:  Prisms |
 70%
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A convex lens A of focal length \(20~\text{cm}\) and a concave lens \(B\) of focal length \(5~\text{cm}\) are kept along the same axis with the distance \(d\) between them. If a parallel beam of light falling on \(A\) leaves \(B\) as a parallel beam, then distance \(d\) in \(\text{cm}\) will be:
1. \(25\)                         
2. \(15\) 
3. \(30\)                         
4. \(50\)

Subtopic:  Lenses |
 57%
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A medium shows relation between i and r as shown. If speed of light in the medium is nc then value of n is

1. 1.5

2. 2

3. 2–1

4. 3–1/2

Subtopic:  Refraction at Plane Surface |
 70%
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For a concave mirror, if the virtual image is formed, the graph between m and u is of the form :

1. 2.
3. 4.

Subtopic:  Reflection at Spherical Surface |
 53%
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For a convex lens, the distance of the object is taken on X-axis and the distance of the image is taken on Y-axis, the nature of the graph so obtained is :

(1) Straight line                     

(2) Circle

(3) Parabola                          

(4) Hyperbola

 

Subtopic:  Lenses |
 55%
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