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Q. No.In a concave lens, a ray of light emanating from the object parallel to the principal axis of the lens, after refraction:
| 1. | emerges parallel to the principal axis |
| 2. | appears to diverge from the first principal focus |
| 3. | passes through \(2F,\) which is the radius of curvature of the lens |
| 4. | passes through the second principal focus |
Subtopic: Lenses |
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A ray of monochromatic light is passing through an equilateral prism \((ABC)\) as shown in the figure. The refracted ray \((QR)\) is parallel to its base \((BC)\) and the angle of incidence \((i)\) is \(50^\circ\). Then the angle of deviation \((\delta)\) is:
| 1. | \(40^\circ\) | 2. | \(45^\circ\) |
| 3. | \(55^\circ\) | 4. | \(35^\circ\) |
Subtopic: Prisms |
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Consider three media \(P,Q\) and \(R\) with refractive indices \(1,\) \(1.25,\) and \(1.5,\) respectively. The medium \(Q\) having a thickness of \(5\) cm is placed between the extended media \(P\) and \(R\) as shown in the figure. An object \(O\) is placed at the centre of medium \(Q.\) If viewed from the medium \(P\) near the normal direction, the apparent depth of \(O\) is \(h_1.\) For similar observation from the medium \(R,\) the apparent depth is \(h_2.\) The value of \(|h_1 - h_2| \) in cm, is:
1. \(3\)
2. \(0\)
3. \(1\)
4. \(2\)
1. \(3\)
2. \(0\)
3. \(1\)
4. \(2\)
Subtopic: Refraction at Plane Surface |
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The lens combination, as shown in the figure, consists of two lenses, \(L_1\) and \(L_2\), of the focal lengths \(+10~\text{cm}\) and \(-10~\text{cm},\) respectively. The position of the image formed is:
1. \(60\) cm to the right of the concave lens
2. \(20\) cm to the left of the concave lens
3. \(60\) cm to the left of the concave lens
4. \(30\) cm to the right of the concave lens
1. \(60\) cm to the right of the concave lens
2. \(20\) cm to the left of the concave lens
3. \(60\) cm to the left of the concave lens
4. \(30\) cm to the right of the concave lens
Subtopic: Reflection at Spherical Surface |
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A microscope has an objective of focal length \(2~\text{cm},\) eyepiece of focal length \(4~\text{cm}\) and the tube length of \(40~\text{cm}.\) If the distance of distinct vision of eye is \(25~\text{cm},\) the magnification in the microscope is:
| 1. | \(150\) | 2. | \(250\) |
| 3. | \(100\) | 4. | \(125\) |
Subtopic: Simple & Compound Microscope |
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NEET - 2025
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In a certain camera, a combination of four similar thin convex lenses are arranged axially in contact. Then the power of the combination and the total magnification in comparison to the power \(( p )\) and magnification \(( m )\) for each lens will be, respectively -
| 1. | \(4 p\) and \(m^4\) | 2. | \(p^4\) and \(m^4\) |
| 3. | \(4 p\) and \(4 m\) | 4. | \(p^4\) and \(4 m\) |
Subtopic: Lenses |
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A light ray enters through a right-angled prism at point \(P\) with the angle of incidence \(30^\circ\) as shown in the figure. It travels through the prism parallel to its base \(BC\) and emerges along the face \(AC.\) The refractive index of the prism is:
| 1. | \({\dfrac{\sqrt5}{2}}\) | 2. | \({\dfrac{\sqrt3}{4}}\) |
| 3. | \({\dfrac{\sqrt3}{2}}\) | 4. | \({\dfrac{\sqrt5}{4}}\) |
Subtopic: Prisms |
Level 3: 35%-60%
NEET - 2024
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A small telescope has an objective of focal length \(140~\text{cm}\) and an eyepiece of focal length \(5.0~\text{cm}.\) The magnifying power of the telescope for viewing a distant object is:
1. \(28\)
2. \(17\)
3. \(32\)
4. \(34\)
1. \(28\)
2. \(17\)
3. \(32\)
4. \(34\)
Subtopic: Telescope |
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For a prism, when the light undergoes minimum deviation, the relationship between the angle of incidence \((i)\) and the angle of emergence \((i')\) is:
| 1. | \(i=i'\) | 2. | \(i>i'\) |
| 3. | \(i<i'\) | 4. | \(i=0\) |
Subtopic: Prisms |
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The graph that shows the correct variation of \(\dfrac{1}{v}\) with \(\dfrac{1}{u}\) for a concave mirror, where \(u\) is the object distance and \(v\) is the image distance, is:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Reflection at Spherical Surface |
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