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Q. No.A biconvex lens \((\mu=1.5)\) has a radius of curvature of magnitude \(20~\text{cm}\). Which one of the following options, best describes, the image formed by an object of height \(2\) cm placed \(30~\text{cm}\) from the lens?
| 1. | virtual, upright, height \(=0.5\) cm |
| 2. | real, inverted, height \(=4\) cm |
| 3. | real, inverted, height \(=1\) cm |
| 4. | virtual, upright, height \(=1\) cm |
Subtopic: Â Lenses |Â Lens Makers' Formula |Â Refraction at Curved Surface |
 70%
From NCERT
AIPMT - 2011
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A point object \((A)\) is placed on the principal axis of a convex lens (focal length = \(30\) cm) at a distance of \(45\) cm from it. The image is formed at position \(B.\) If the object \(A\) is moved up by \(1\) cm then the image moves:
1. down by \(1\) cm
2. down by \(2\) cm
3. up by \(1\) cm
4. up by \(2\) cm
1. down by \(1\) cm
2. down by \(2\) cm
3. up by \(1\) cm
4. up by \(2\) cm
Subtopic: Â Lenses |
 62%
From NCERT
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A parallel beam of width \(20\) mm is incident onto a lens and the width of the emerging beam decreases at a rate of \(1\) mm as it travels every \(3\) cm. The lens has a focal length of:
| 1. | \(30\) cm | 2. | \(60\) cm |
| 3. | \(\dfrac{20}3\) cm | 4. | \(\dfrac{40}{3}\) cm |
Subtopic: Â Lenses |
 66%
From NCERT
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A biconvex lens has radii of curvature, \(20\) cm each. If the refractive index of the material of the lens is \(1.5,\) the power of the lens is:
| 1. | infinity | 2. | \(+2\) D |
| 3. | \(+20\) D | 4. | \(+5\) D |
Subtopic: Â Lenses |
 71%
From NCERT
NEET - 2022
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A concave lens of focal length \(-25\) cm is sandwiched between two convex lenses, each of focal length, \(40\) cm. The power in dioptre of the combined lens would be:
| 1. | \(55\) | 2. | \(9\) |
| 3. | \(1\) | 4. | \(0.01\) |
Subtopic: Â Lenses |
 67%
From NCERT
NEET - 2022
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