The refractive index of the material of a prism is and the angle of the prism is \(30^\circ.\) One of the two refracting surfaces of the prism is made a mirror inwards with a silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if the angle of incidence on the prism is:
1. \(60^\circ\)
2. \(45^\circ\)
3. \(30^\circ\)
4. zero

Subtopic:  Prisms |
 71%
From NCERT
NEET - 2018
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An object is placed at a distance of \(40\) cm from a concave mirror of a focal length of \(15\) cm. If the object is displaced through a distance of \(20\) cm towards the mirror, the displacement of the image will be:

1. \(30\) cm away from the mirror
2. \(36\) cm away from the mirror
3. \(30\) cm towards the mirror
4. \(36\) cm towards the mirror

Subtopic:  Reflection at Spherical Surface |
 74%
From NCERT
NEET - 2018
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A person can see objects clearly only when they lie between \(50\) cm and \(400\) cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be:

1. convex, \(+2.25\) D 2. concave, \(-0.25\) D
3. concave, \(-0.2\) D 4. convex, \(+0.5\) D
Subtopic:  Human Eye |
 72%
From NCERT
NEET - 2016
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An astronomical refracting telescope will have large angular magnification and high angular resolution when it has an objective lens of:

1. small focal length and large diameter.
2. large focal length and small diameter.
3. large focal length and large diameter.
4. small focal length and small diameter. 

Subtopic:  Telescope |
 59%
From NCERT
NEET - 2018
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A beam of light consisting of red, green, and blue colours is incident on a right-angled prism. The refractive index of the material of the prism for the red, green, and blue wavelengths is \(1.39\), \(1.44\), and \(1.47\) respectively. 
   
The prism will:

1. separate the blue colour part from the red and green colour
2. separate all the three colours from one another
3. not separate the three colours at all 
4. separate the red colour part from the green and blue colours
Subtopic:  Prisms |
 63%
From NCERT
NEET - 2015
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Two identical thin plano-convex glass lenses (refractive index = \(1.5\)) each having radius of curvature of \(20\) cm are placed with their convex surfaces in contact at the centre. The intervening space is filled with oil of a refractive index of \(1.7\). The focal length of the combination is:
1. \(-20\) cm
2. \(-25\) cm
3. \(-50\) cm
4. \(50\) cm

Subtopic:  Lens Makers' Formula |
 60%
From NCERT
NEET - 2015
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The refracting angle of a prism is \(A,\) and the refractive index of the material of the prism is \(\text{cot} \frac{A}{2}.\) The angle of minimum deviation is:
1. \(180^\circ-3A\)
2. \(180^\circ-2A\)
3. \(90^\circ-A\)
4. \(180^\circ+2A\)
Subtopic:  Prisms |
 81%
From NCERT
NEET - 2015
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A boy is trying to start a fire by focusing sunlight on a piece of paper using an equiconvex lens of a focal length of \(10\) cm. The diameter of the sun is \(1.39\times10^9\) m and its mean distance from the earth is \(1.5\times10^{11}\) m. What is the diameter of the sun's image on the paper?
 

1. \(9.2\times10^{-4}\) m 2. \(6.5\times10^{-4}\) m
3. \(6.5\times10^{-5}\) m 4. \(12.4\times10^{-4}\) m
Subtopic:  Lenses |
 58%
From NCERT
AIPMT - 2008
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A small coin is resting on the bottom of a beaker filled with a liquid. A ray of light from the coin travels up, to the surface of the liquid and moves along its surface (see figure). 
                
How fast is the light traveling in the liquid?

1. \(1.8 \times 10^8 \mathrm{~m} / \mathrm{s} \) 2. \(2.4 \times 10^8 \mathrm{~m} / \mathrm{s} \)
3. \(3.0 \times 10^8 \mathrm{~m} / \mathrm{s} \) 4. \(1.2 \times 10^8 \mathrm{~m} / \mathrm{s}\)
Subtopic:  Total Internal Reflection |
 63%
From NCERT
AIPMT - 2007
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The frequency of a light wave in a material is 2×1014 Hz and the wavelength is 5000 Å. The refractive index of the material will be:

1. 1.40

2. 1.50

3. 3.00

4. 1.33

Subtopic:  Refraction at Plane Surface |
 77%
From NCERT
AIPMT - 2007
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