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 |
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Two convex lenses of focal lengths 10 cm and 30 cm are kept at a separation of 20 cm. Then the correct statement is:

1. the effective focal length is 15 cm

2. chromatic aberration is minimized

3. combination behaves like a convergent lens

4. All of these

Subtopic:  Lenses |
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The focal length of a convex lens is 40 cm and the size of the inverted image formed is half of the object. The distance of the object is:

1. 60 cm

2. 120 cm

3. 30 cm

4. 180 cm

Subtopic:  Lenses |
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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 |
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A lens forms an image of a point object placed at distance 20 cm from it. The image is formed just in front of the object at a distance 4 cm from the object (and towards the lens). The power of the lens is:

1.  $-$2.25 D

2.  1.75 D

3.  $-$1.25 D

4.  1.4 D

Subtopic:  Lenses |
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In the diagram shown below, the image of the point object O is formed at l by the convex lens of focal length 20 cm, where F1 and F2 are foci of the lens. The value of x' is:

1.  10 cm

2.  20 cm

3.  30 cm

4.  40 cm

Subtopic:  Lenses |
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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= P2 = P3

2. P1 > P2 = P3

3. P1 < P2 = P3

4. P2 = P3 = 2P1

Subtopic:  Lenses |
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Two similar plano-convex lenses are combined together in three different ways as shown in the adjoining figure. The ratio of the focal lengths in three cases will be:

1. 2 : 2 : 1

2. 1 : 1 : 1

3. 1 : 2 : 2

4. 2 : 1 : 1

Subtopic:  Lenses |
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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.

3.  X - Y

4.

Subtopic:  Lenses |
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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 |
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