# A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that its end closer to the pole is 20 cm away from the mirror. The length of the image is: 1. 10 cm 2. 15 cm 3. 2.5 cm 4. 5 cm

Subtopic:  Reflection at Spherical Surface |
60%
From NCERT
NEET - 2012
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A plane-convex lens fits exactly into a plano-concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices μ1 and μ2 and R is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is:
1. R/2(μ1 + μ2)
2. R/2(μ1 - μ2)
3. R/(μ1 - μ2)
4. 2R/(μ- μ1)

Subtopic:  Lens Makers' Formula |
60%
From NCERT
NEET - 2013
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The refracting angle of a prism is $$\text{A}$$, and refractive index of the material of the prism is cot(A/2). The angle of minimum deviation is:

1. $$180^{\circ}-3\text{A}$$

2. $$180^{\circ}-2\text{A}$$

3. $$90^{\circ}-\text{A}$$

4. $$180^{\circ}+2\text{A}$$

Subtopic:  Prisms |
78%
From NCERT
NEET - 2015
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A point object is moving on the principal axis of a concave mirror of focal length 24 cm towards the mirror. When it is at a distance of 60 cm from the mirror, its velocity is 9 cm/secWhat is the velocity of the image at that instant?

 1 5 cm/sec towards the mirror 2 4 cm/sec towards the mirror 3 4 cm/sec away from the mirror 4 9 cm/sec away from the mirror

Subtopic:  Reflection at Spherical Surface |
53%
From NCERT
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A luminous object is placed at a distance of 30 cm from the convex lens with a focal length of 20 cm. On the other side of the lens, at what distance from the lens, a convex mirror with a radius of curvature of 10 cm be placed in order to have an upright image of the object coincident with it?

 1 12 cm 2 30 cm 3 50 cm 4 60 cm
Subtopic:  Lenses |
52%
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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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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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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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 rod of glass ($\mu$ = 1.5) and of the square cross-section is bent into the shape as shown. A parallel beam of light falls on the plane flat surface A as shown in the figure. If d is the width of a side and R is the radius of a circular arc then for what maximum value of $\frac{d}{R}$, light entering the glass slab through surface A will emerge from the glass through B?

 1 1.5 2 0.5 3 1.3 4 None of these
Subtopic:  Total Internal Reflection |
57%
From NCERT
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