Select Question Set:
Q. No.A concave lens with a focal length of \(-25~\text{cm}\) is sandwiched between two convex lenses, each with a focal length of \(40~\text{cm}.\) The power (in diopters) of the combined lens system would be:
1.
\(55\)
2.
\(9\)
3.
\(1\)
4.
\(0.01\)
Subtopic: Lenses |
68%
From NCERT
NEET - 2022
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
A beam of light is incident vertically on a glass slab of thickness \(1~\text{cm},\) and refractive index \(1.5.\) A fraction \(A\) is reflected from the front surface while another fraction \(B\) enters the slab and emerges after reflection from the back surface. The time delay between them is:
| 1. | \(10^{-10}~\text{s}\) | 2. | \(5\times 10^{-10}~\text{s}\) |
| 3. | \(10^{-11}~\text{s}\) | 4. | \(5\times 10^{-11}~\text{s}\) |
Subtopic: Refraction at Plane Surface |
58%
From NCERT
NEET - 2022
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Given below are two statements:
| Assertion (A): | There is no dispersion of light refracted through a rectangular glass slab. |
| Reason (R): | Dispersion of light is the phenomenon of splitting of a beam of white light into its constituent colours. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Prisms |
79%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Given below are two statements:
| Assertion (A): | If objective and eye lenses of a microscope are interchanged, then it can work as telescope. |
| Reason (R): | The objective lens of telescope has small focal length. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Telescope |
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
A parallel beam of light is incident onto a converging lens \((L_1)\) of focal length \(20~\text{cm}.\) A second identical lens \((L_2)\) is to be placed behind \(L_1,\) coaxially, so that the emerging beam is parallel. The distance between \(L_1\) and \(L_2\) should be:
| 1. | \(10\) cm | 2. | \(20\) cm |
| 3. | \(40\) cm | 4. | zero |
Subtopic: Lenses |
77%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
The magnifying power of an astronomical telescope is \(8,\) and the distance between the two lenses is \(54\) cm. The focal lengths of the eye lens and the objective lens are, respectively:
| 1. | \(6\) cm and \(48\) cm |
| 2. | \(48\) cm and \(6\) cm |
| 3. | \(8\) cm and \(64\) cm |
| 4. | \(64\) cm and \(8\) cm |
Subtopic: Telescope |
78%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
If the angle of the prism is \(60^\circ\) and the angle of minimum deviation is \(40^\circ,\) the angle of refraction will be:
1. \(30^\circ\)
2. \(60^\circ\)
3. \(100^\circ\)
4. \(120^\circ\)
1. \(30^\circ\)
2. \(60^\circ\)
3. \(100^\circ\)
4. \(120^\circ\)
Subtopic: Prisms |
73%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
An air bubble in a glass slab \((\mu=1.5) \) is \(5\) cm deep when viewed from one face and \(2\) cm deep when viewed from the opposite face. The thickness of the slab is:
1. \(10\) cm
2. \(7.5\) cm
3. \(10.5\) cm
4. \(7\) cm
1. \(10\) cm
2. \(7.5\) cm
3. \(10.5\) cm
4. \(7\) cm
Subtopic: Refraction at Plane Surface |
81%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
As light traverses through an optical medium, it is observed that its wavelength decreases.
| Statement I: | In this case, the frequency of light increases. |
| Statement II: | In the above case, the refractive index of the medium increases. |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
Subtopic: Refraction at Plane Surface |
65%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
The graph between \(\dfrac1u\) and \(\dfrac1v\) for a thin convex lens in order to determine its focal length is plotted as shown in the figure. The refractive index of the lens is \(1.5\) and both surfaces have the same radius of curvature \(R.\) The value of \(R\) will be: (where \(u\) = object distance, \(v\) = image distance)
1. \(10~\text{cm}\)
2. \(20~\text{cm}\)
3. \(30~\text{cm}\)
4. \(40~\text{cm}\)
1. \(10~\text{cm}\)
2. \(20~\text{cm}\)
3. \(30~\text{cm}\)
4. \(40~\text{cm}\)
Subtopic: Lens Makers' Formula |
67%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Select Question Set:
© 2025 GoodEd Technologies Pvt. Ltd.