# A diverging beam of light from a point source S having divergence angle $\alpha$, falls symmetrically on a glass slab as shown. The angles of incidence of the two extreme rays are equal. If the thickness of the glass slab is t and the refractive index n, then the divergence angle of the emergent beam is:     1. Zero                                        2. $\alpha$ 3. ${\mathrm{sin}}^{-1}\left(1/n\right)$                            4. $2{\mathrm{sin}}^{-1}\left(1/n\right)$

Subtopic:  Refraction at Plane Surface |
52%
From NCERT
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A concave mirror is placed at the bottom of an empty tank with face upwards and axis vertical. When sunlight falls normally on the mirror, it is focused at distance of 32 cm from the mirror. If the tank is filled with water $\left(\mu =\frac{4}{3}\right)$ upto a height of 20 cm, then the sunlight will now get focussed at

(1) 16 cm above water level

(2) 9 cm above water level

(3) 24 cm below water level

(4) 9 cm below water level

Subtopic:  Refraction at Plane Surface |
54%
From NCERT
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The slab of a refractive index material equal to 2 shown in the figure has a curved surface APB of a radius of curvature of 10 cm and a plane surface CD. On the left of APB is air and on the right of CD is water with refractive indices as given in the figure. An object O is placed at a distance of 15 cm from pole P as shown. The distance of the final image of O from P as viewed from the left is:

 1 20 cm 2 30 cm 3 40 cm 4 50 cm
Subtopic:  Refraction at Curved Surface |
61%
From NCERT
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The distance between a convex lens and a plane mirror is 10 cm. The parallel rays incident on the convex lens, after reflection from the mirror form image at the optical centre of the lens. Focal length of the lens will be:

 1 10 cm 2 20 cm 3 30 cm 4 Cannot be determined
Subtopic:  Lenses |
61%
From NCERT
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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. If${}_{a}\mu _{g}$ = 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 |
From NCERT
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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) $\sqrt{\left(5/2\right)}$

(3) $\sqrt{\left(3/2\right)}$

(4) 3/2

Subtopic:  Refraction at Plane Surface |
61%
From NCERT
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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%
From NCERT
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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 |
66%
From NCERT
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The graph between u and v for a convex mirror is:

 1 2 3 4
Subtopic:  Reflection at Spherical Surface |
From NCERT
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A glass prism $\left(\mu =1.5\right)$ is dipped in water $\left(\mu =4/3\right)$ as shown in figure. A light ray is incident normally on the surface AB. It reaches the surface BC after totally reflected, if

(a)                             (b)

(c)                             (d) It is not possible

Subtopic:  Prisms |
70%
From NCERT
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