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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 |
Subtopic: Â Lenses |
 64%
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 |
 64%
From NCERT
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A biconvex lens has radii of curvature, \(20~\text{cm}\) each. If the refractive index of the material of the lens is \(1.5,\) the power of the lens is:
| 1. | infinity | 2. | \(+2~\text{D}\) |
| 3. | \(+20 ~\text{D}\) | 4. | \(+5~\text{D}\) |
Subtopic: Â Lenses |
 72%
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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Q. No.
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