A small air bubble is present exactly at the centre of a glass sphere. Size of the image as seen from outside is of

(1) Same size

(2) Bigger

(3) Smaller

(4) May be smaller or bigger depending on the distance of observer

Subtopic:  Refraction at Curved Surface |
From NCERT
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Three identical thin convex lenses are kept as shown in the figure. A ray passing through the lenses is shown. The focal length of each lens is 

1.  5 cm

2.  10 cm

3.  15 cm

4.  20 cm

 

Subtopic:  Lenses |
 55%
From NCERT
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An object is at a distance of 30 cm in front of a concave mirror of focal length 10 cm. The image of the object will be:

1. smaller in size.
2. inverted.
3. between the focus and centre of curvature.
4. All of the above.

Subtopic:  Reflection at Spherical Surface |
 86%
From NCERT
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To a diver inside water, the setting sun will appear at an angle (with the horizontal) of: \(\left[ \mu_w = \frac{5}{4} \right]\)

1. \(53^{\circ}\)

2. \(37^{\circ}\)

3. \(45^{\circ}\)

4. \(60^{\circ}\)

Subtopic:  Total Internal Reflection |
From NCERT
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In normal adjustment, the angular magnification of an astronomical telescope is 39. If the length of the tube is 2 m, then the focal length of the objective and eyepiece are respectively,

(1) 195 cm, 5 cm

(2) 190 cm, 10 cm

(3) 20 cm, 180 cm

(4) 10 cm, 190 cm

Subtopic:  Telescope |
 80%
From NCERT
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The following diagram shows a glass sphere of radius 10 cm with a paraxial incident ray. The refractive index of the material of the glass is

1.  2

2.  1.5

3.  1.75

4.  1.3

Subtopic:  Refraction at Curved Surface |
 57%
From NCERT
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A convex lens of focal length 10 cm form real image of an object. The distance between the object and the image may be:

(1) 25 cm

(2) 30 cm

(3) 38 cm

(4) 50 cm

Subtopic:  Lenses |
From NCERT
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A spherical fishbowl of radius 15 cm is filled with water of refractive index 43. A cat standing outside in the air at a distance of 30 cm from the centre of the fishbowl is looking at the fish. At what distance from the centre would the cat appear to the fish situated at the centre?

1. 45 cm 2. 30 cm
3. 15 cm 4. 25 cm
Subtopic:  Refraction at Curved Surface |
 50%
From NCERT
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Two convex lenses of focal length X and Y are placed parallel to each other. An object at infinity from the first lens forms its image at infinity from the second lens. The separation between the two lenses should be:

1. X + Y 2. \(\frac{X   +   Y}{2}\)
3. X - Y 4. \(\frac{X   -   Y}{2}\)
Subtopic:  Lenses |
 67%
From NCERT
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Two plane mirrors are placed perpendicular to each other as shown in the figure. An object O is kept at the angular bisector of the two mirrors. Numbers of images of object O is formed, will be:

1.  4

2.  3

3.  2

4.  1

Subtopic:  Reflection at Plane Surface |
 81%
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