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 |
 61%
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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 

            

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 cm and a concave lens B of focal length 5 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 cm will be 

(1) 25                         

(2) 15

(3) 30                         

(4) 50

Subtopic:  Lenses |
 58%
From NCERT
NEET - 2021
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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%
From NCERT
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For a concave mirror, if the virtual image is formed, the graph between m and u is of the form :

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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The diameter of a plano-convex lens is 6 cm and thickness at the centre is 3 mm. If the

speed of light in the material of the lens is 2×108msec, the focal length of the lens is

1. 15 cm                         

2. 20 cm

3. 30 cm                         

4. 10 cm

Subtopic:  Lenses |
 53%
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