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

                        

(a) 5/2                                    (b) 5/2

(c) 3/2                               (d) 3/2

Concept Questions :-

Refraction at plane surface
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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 

            

Concept Questions :-

Reflection at spherical surface
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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 changes from 0 to  the graph between v versus u will be

Concept Questions :-

Reflection at spherical surface
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The graph between u and v for a convex mirror is

Concept Questions :-

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

Concept Questions :-

Total internal reflection
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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 

(a) 25                         (b) 15

(c) 30                          (d) 50

Concept Questions :-

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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

(a)   1.5

(b)   2

(c)   2–1

(d)   3–1/2

Concept Questions :-

Refraction at plane surface
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For a concave mirror, if the virtual image is formed, the graph between m and u is of the form :

Concept Questions :-

Reflection at spherical surface
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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 :

(a) Straight line                      (b) Circle

(c) Parabola                           (d) Hyperbola

 

Concept Questions :-

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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

(a) 15 cm                         (b) 20 cm

(c) 30 cm                         (d) 10 cm

Concept Questions :-

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