Q. No.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: Â Refraction at Plane Surface |
 66%
Level 2: 60%+
Hints
A light ray falls on a glass surface of refractive index \(\sqrt{3}\), at an angle of \(60^\circ.\) The angle between the refracted and reflected rays would be:
| 1. | \(120^\circ\) | 2. | \(30^\circ\) |
| 3. | \(60^\circ\) | 4. | \(90^\circ\) |
Subtopic: Â Refraction at Plane Surface |
 62%
Level 2: 60%+
NEET - 2022
Hints
Unlock IMPORTANT QUESTION
This question was bookmarked by 5 NEET 2025 toppers during their NEETprep journey. Get Target Batch to see this question.
✨ Perfect for quick revision & accuracy boost
Buy Target Batch
Access all premium questions instantly
There are certain materials developed in laboratories that have a negative refractive index (figure). A ray incident from the air (medium-\(1\)) into such a medium (medium-\(2\)) shall follow a path given by:
| 1. |  |
| 2. |  |
| 3. |  |
| 4. |  |
Subtopic: Â Refraction at Plane Surface |
 53%
Level 3: 35%-60%
Hints
In the figure below, \(PQRS\) denotes the path followed by a ray of light as it travels through three media in succession. The absolute refractive indices of the media are \(\mu_1, ~\mu_2, ~\text{and}~\mu_3\) respectively (The line segment \(RS'\) in the figure is parallel to \(PQ\)).
| 1. | \(\mu_1> \mu_2>\mu_3\) | 2. | \(\mu_1= \mu_2>\mu_3\) |
| 3. | \(\mu_1< \mu_2<\mu_3\) | 4. | \(\mu_1< \mu_3<\mu_2\) |
Subtopic: Â Refraction at Plane Surface |
 62%
Level 2: 60%+
Please attempt this question first.
Hints
Please attempt this question first.
A short pulse of white light is incident from air to a glass slab at normal incidence. After travelling through the slab, the first colour to emerge is
1. blue.
2. green.
3. violet.
4. red.
1. blue.
2. green.
3. violet.
4. red.
Subtopic: Â Refraction at Plane Surface |
 61%
Level 2: 60%+
Please attempt this question first.
Hints
Please attempt this question first.
The optical density of turpentine is higher than that of water while its mass density is lower. Figure shows a layer of turpentine floating over water in a container. For which one of the four rays incident on turpentine in Figure, the path shown is correct?
1. \(1\)
2. \(2\)
3. \(3\)
4. \(4\)
1. \(1\)
2. \(2\)
3. \(3\)
4. \(4\)
Subtopic: Â Refraction at Plane Surface |
 61%
Level 2: 60%+
Please attempt this question first.
Hints
Please attempt this question first.
The time taken by sunlight to pass through a glass slab of thickness \(5~\text{mm}\) and refractive index \(1.5\) is:
| 1. | \(\left(\dfrac{5}{3}\right) \times 10^{-8}~\text{s}\) | 2. | \(\left(\dfrac{5}{2}\right) \times 10^{-11}~\text{s}\) |
| 3. | \(\left(\dfrac{5}{3}\right) \times 10^{-11}~\text{s}\) | 4. | \(\left(\dfrac{5}{2}\right)\times 10^{-8}~\text{s}\) |
Subtopic: Â Refraction at Plane Surface |
 74%
Level 2: 60%+
NEET - 2024
Hints
Consider a ray of light incident from air onto a slab of glass (refractive index \(n\)) of width \(d\), at an angle \(\theta\). The phase difference between the ray reflected by the top surface of the glass and the bottom surface is
1. \(\dfrac{4 \pi d}{\lambda}\left(1-\dfrac{1}{n^2} \sin ^2 \theta\right)^{1 / 2}+\pi \)
2. \(\dfrac{4 \pi d}{\lambda}\left(1-\dfrac{1}{n^2} \sin ^2 \theta\right)^{1 / 2} \)
3. \(\dfrac{4 \pi d}{\lambda}\left(1-\dfrac{1}{n^2} \sin ^2 \theta\right)^{1 / 2}+\dfrac{\pi}{2} \)
4. \(\dfrac{4 \pi d}{\lambda}\left(1-\dfrac{1}{n^2} \sin ^2 \theta\right)^{1 / 2}+2 \pi\)
1. \(\dfrac{4 \pi d}{\lambda}\left(1-\dfrac{1}{n^2} \sin ^2 \theta\right)^{1 / 2}+\pi \)
2. \(\dfrac{4 \pi d}{\lambda}\left(1-\dfrac{1}{n^2} \sin ^2 \theta\right)^{1 / 2} \)
3. \(\dfrac{4 \pi d}{\lambda}\left(1-\dfrac{1}{n^2} \sin ^2 \theta\right)^{1 / 2}+\dfrac{\pi}{2} \)
4. \(\dfrac{4 \pi d}{\lambda}\left(1-\dfrac{1}{n^2} \sin ^2 \theta\right)^{1 / 2}+2 \pi\)
Subtopic: Â Refraction at Plane Surface |
Level 3: 35%-60%
Please attempt this question first.
Hints
Please attempt this question first.
A glass slab of refractive index \(1.47\) disappears in a trough of liquid. The refractive index of the liquid will be:
| 1. | \(\dfrac{1.47}{\sqrt {2}}\) | 2. | \(1.47\sqrt {2}\) |
| 3. | \(1.47\) | 4. | \(1.0\) |
Subtopic: Â Refraction at Plane Surface |
 84%
Level 1: 80%+
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: Â Refraction at Plane Surface |
 81%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
© 2026 GoodEd Technologies Pvt. Ltd.