A thin rod of length \(\frac{f}{3}\) lies along the axis of a concave mirror of focal length \(f\). One end of its magnified, real image touches an end of the rod. The length of the image is:

1. \(f\)

2. \(\frac{f}{2}\)

3. \(2f\)

4. \(\frac{f}{4}\)

Subtopic:  Reflection at Spherical Surface |
 58%
From NCERT
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A thin equiconvex lens of power P is cut into three parts A, B, and C as shown in the figure. If P1, P2, and P3 are powers of the three parts respectively, then:

 

1. \(P_1=P_2=P_3\) 2. \(P_1>P_2=P_3\)
3. \(P_1<P_2=P_3\) 4. \(P_2=P_3=2P_1\)
Subtopic:  Lenses |
 69%
From NCERT
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A point source of light B is placed at a distance L in front of the centre of a mirror of width d hung vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror at a distance 2L from it as shown. The greatest distance over which he can see the image of the light source in the mirror is:
                       
1. d/2                                     

2. d

3. 2d                                       

4. 3d

Subtopic:  Reflection at Plane Surface |
 59%
From NCERT
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The focal length of the objective lens and the eye lens is 4 mm and 25 mm respectively in a compound microscope. The distance between objective and eyepiece lens is 16 cm. Find its magnifying power for relaxed eye position:

1. 32.75   
2. 327.5 
3. 0.3275 
4. None of the above

Subtopic:  Simple & Compound Microscope |
 61%
From NCERT
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A medium shows relation between i and r as shown. If the speed of light in the medium is nc then the value of n is:

                  

1. 1.5

2. 2

3. 2–1

4. 3–1/2

Subtopic:  Refraction at Plane Surface |
 76%
From NCERT
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A person can see clearly objects 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, + 0.15 D

Subtopic:  Human Eye |
 76%
From NCERT
NEET - 2016
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In an astronomical telescope in normal adjustment a straight black line of length \(L\) is drawn on inside part of the objective lens. The eye-piece forms a real image of this line. The length of this image is \(l\). The magnification of the telescope is:
1. \(\frac{L}{l+1}\)
2. \(\frac{L}{l-1}\)
3. \(\frac{L+1}{L-1}\)
4. \(\frac{L}{l}\)

Subtopic:  Telescope |
 60%
From NCERT
NEET - 2015
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For the angle of minimum deviation of a prism to be equal to its refracting angle, the prism must be made of a material whose refractive index:

1. lies between\(\sqrt{2} \text { and } 1 \text {. }\)
2. lies between 2 and \(\sqrt{2} \)
3. is less than 1.
4. is greater than 2.


 

Subtopic:  Prisms |
 64%
From NCERT
NEET - 2012
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A converging beam of rays is incident on a diverging lens. Having passed through the lens the rays intersect at a point \(15~\mathrm{cm}\) from the lens on the opposite side. If the lens is removed the point where the rays meet will move 5 cm closer to the lens. The focal length of the lens is:

1. -10 cm 2. 20 cm
3. -30 cm 4. 5 cm
Subtopic:  Lenses |
 65%
From NCERT
NEET - 2011
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The speed of light in media M1 and M2 is 1.5×108 m/s and 2.0×108 m/s respectively. A ray of light enters from medium M1 to M2 at an incidence angle i. If the ray suffers total internal reflection, the value of i is:

1. equal to \(\sin ^{-1}\left(\frac{2}{3}\right)\)
2. equal to or less than \(\sin ^{-1}\left(\frac{3}{5}\right)\) 
3. equal to or greater than \(\sin ^{-1}\left(\frac{3}{4}\right)\)
4. less than \(\sin ^{-1}\left(\frac{2}{3}\right)\)
Subtopic:  Total Internal Reflection |
 88%
From NCERT
NEET - 2010
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