# A tall man, of height $$6$$ feet, wants to see his full image. The required minimum length of the mirror will be: 1. $$12$$ feet 2. $$3$$ feet 3. $$6$$ feet 4. Any length

Subtopic:  Reflection at Plane Surface |
85%
From NCERT
AIPMT - 2000
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The refractive index of the material of a prism is $\sqrt{2}$ and its refracting angle is $$30^{\circ}$$. One of the refracting surfaces of the prism is made a mirror inwards. A beam of monochromatic light entering the prism from the other face will retrace its path after reflection from the mirrored surface if its angle of incidence on the prism is:
1. $$60^{\circ}$$
2. $$0^{\circ}$$
3. $$30^{\circ}$$
4. $$45^{\circ}$$

Subtopic:  Prisms |
79%
From NCERT
AIPMT - 2004
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For the given incident ray as shown in the figure, in the condition of the total internal reflection of this ray, the minimum refractive index of the prism will be:

1. $\frac{\sqrt{3}+1}{2}$

2. $\frac{\sqrt{2}+1}{2}$

3. $\sqrt{\frac{3}{2}}$

4. $\sqrt{\frac{7}{6}}$

Subtopic:  Total Internal Reflection |
55%
From NCERT
AIPMT - 2002
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A biconvex lens is cut into two halves along (i) XOX' and (ii) YOY' as shown in the figure. Let $$f$$, $$f'$$ $$f''$$ be the focal lengths of the complete lens, of each half in case (i), and of each half in case (ii), respectively.

Choose the correct statement from the following:

 1 $$f' = f,f'' =2f$$ 2 $$f' = 2f, f''=f$$ 3 $$f' =f, f''=f$$ 4 $$f'=2f, f''=2f$$
Subtopic:  Lenses |
81%
From NCERT
AIPMT - 2003
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Light enters at an angle of incidence in a transparent rod of refractive index n. For what value of the refractive index of the material of the rod, will the light, once entered into it, not leave it through its lateral face whatsoever be the value of the angle of incidence?
1. $n$ $>\sqrt{2}$
2. 1.0
3. 1.3
4. 1.4

Subtopic:  Total Internal Reflection |
73%
From NCERT
AIPMT - 1998
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A rainbow is formed due to:

 1 Scattering & refraction 2 Total internal reflection & dispersion 3 Reflection only 4 Diffraction and dispersion

Subtopic:  Total Internal Reflection |
80%
From NCERT
AIPMT - 2000
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A concave mirror gives an image three times as large as the object placed at a distance of 20 cm from it. For the image to be real, the focal length should be:

 1 10 cm 2 15 cm 3 20 cm 4 30 cm
Subtopic:  Reflection at Spherical Surface |
61%
From NCERT
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If the focal length of the objective lens is increased, then magnifying power of:

 1 microscope will increase but that of telescope decrease 2 microscope and telescope both will increase 3 microscope and telescope both will decrease 4 microscope will decrease but that of the telescope will increase
Subtopic:  Simple & Compound Microscope |
67%
From NCERT
AIPMT - 2014
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An air bubble in a glass slab with refractive index 1.5 (near-normal incidence) is 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The thickness (in cm) of the slab is:

 1 8 2 10 3 12 4 16
Subtopic:  Refraction at Plane Surface |
74%
From NCERT
NEET - 2016
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Choose the correct mirror image of the figure:

 1 2 3 4
Subtopic:  Reflection at Plane Surface |
77%
From NCERT
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