# A convex mirror of focal length $$f$$ forms an image which is $$\frac{1}{n}$$ times the length of the object. The distance of the object from the mirror is: 1. $$(n-1)f$$ 2. $$\left( \frac{n-1}{n} \right)f$$ 3. $$\left( \frac{n+1}{n} \right)f$$ 4. $$(n+1)f$$

Subtopic:  Reflection at Spherical Surface |
62%
From NCERT
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A mark on the surface of sphere (µ = 3/2) is viewed from a diametrically opposite position. It appears to be at a distance $$15~\mathrm{cm}$$ from its actual position. The radius of sphere is:
1. 15 cm
2. 5 cm
3. 7.5 cm
4. 2.5 cm

Subtopic:  Refraction at Curved Surface |
53%
From NCERT
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A light ray from the air is incident (as shown in the figure) at one end of glass fibre (refractive index µ = 1.5) making an incidence angle of 60° on the lateral surface so that it undergoes a total internal reflection. How much time would it take to traverse the straight fibre of a length of 1 km?

1. 3.33 $\mu s$

2. 6.67 $\mu s$

3. 5.77 $\mu s$

4. 3.85 $\mu s$

Subtopic:  Total Internal Reflection |
From NCERT
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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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If there had been one eye of a man, then:

 1 image of the object would have been inverted 2 visible region would have decreased 3 image would have not been seen in three dimensional 4 Both (2) and (3)

Subtopic:  Human Eye |
55%
From NCERT
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The near point of a person is 50 cm and the far point is 1.5 m. The spectacles required for reading purposes and for seeing distant objects are respectively:

1. + 2D, $$-\frac{2}{3}~D$$
2. $$+\frac{2}{3}~D$$, - 2 D

3. - 2 D, $$+\frac{2}{3}~D$$

4. $$-\frac{2}{3}~D$$, + 2 D

Subtopic:  Human Eye |
71%
From NCERT
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A concave lens of focal length 25 cm produces an image $\frac{1}{10}\mathrm{th}$ the size of the object. The distance of the object from the lens is:

1. 225 cm

2. 250 cm

3. 150 cm

4. 175 cm

Subtopic:  Lenses |
82%
From NCERT
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Focal lengths of objective and eyepiece of a compound microscope are 2 cm and 6.25 cm respectively. An object AB is placed at a distance of 2.5 cm from the objective which forms the image A'B' as shown in the figure. Maximum magnifying power in this case, will be:

 1 10 2 20 3 5 4 25
Subtopic:  Simple & Compound Microscope |
68%
From NCERT
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If the space between two convex lenses of glass in the combination shown in the figure below is filled with water, then:

 1 the focal length of the system will decrease. 2 the focal length of the system will increase. 3 the power of the system will increase. 4 the power of the system will become infinite.

Subtopic:  Lenses |
62%
From NCERT
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An astronomical telescope has angular magnification of 20 in its normal adjustment. Focal length of eyepiece is 4 cm. Distance between objective and eyepiece is:

1. 80 cm

2. 84 cm

3. 76 cm

4. 90 cm

Subtopic:  Telescope |
82%
From NCERT
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