Light travels a distance $$x$$ in time $$t_1$$ in air and $$10x$$ in time $$t_2$$ in another denser medium. What is the critical angle for this medium?
 1 $$\sin ^{-1}\left(\frac{10 t_1}{t_2}\right)$$ 2 $$\sin ^{-1}\left(\frac{ t_2}{t_1}\right)$$ 3 $$\sin ^{-1}\left(\frac{10 t_2}{t_1}\right)$$ 4 $$\sin ^{-1}\left(\frac{ t_1}{10t_2}\right)$$
Subtopic:  Total Internal Reflection |
62%
From NCERT
NEET - 2023
Hints

In the figure shown here, what is the equivalent focal length of the combination of lenses? (Assume that all layers are thin)

1. $$-50~\mathrm{cm}$$
2. $$40~\mathrm{cm}$$
3. $$-40~\mathrm{cm}$$
4. $$-100~\mathrm{cm}$$
Subtopic:  Lens Makers' Formula |
From NCERT
NEET - 2023
Hints

Two thin lenses are of the same focal lengths ($$f$$), but one is convex and the other one is concave. When they are placed in contact with each other, the equivalent focal length of the combination will be:
1. infinite
2. zero
3. $$f/4$$
4. $$f/2$$
Subtopic:  Lenses |
58%
From NCERT
NEET - 2023
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A lens is made up of $$3$$ different transparent media as shown in the figure. A point object $$O$$ is placed on its axis beyond $$2f$$. How many real images will be obtained on the other side?

 1 $$2$$ 2 $$1$$ 3 No image will be formed 4 $$3$$
Subtopic:  Lenses |
60%
From NCERT
NEET - 2023
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A horizontal ray of light is incident on the right angled prism with prism angle $$6^\circ$$. If the refractive index of the material of the prism is $$1.5$$, then the angle of emergence will be:

1. $$9^\circ$$
2. $$10^\circ$$
3. $$4^\circ$$
4. $$6^\circ$$
Subtopic:  Prisms |
54%
From NCERT
NEET - 2023
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Which set of colors will come out in air for a situation shown in figure?
 1 Yellow, Orange and Red 2 Blue, Green and Yellow 3 Orange, Red and Violet 4 All
Subtopic:  Total Internal Reflection |
70%
From NCERT
NEET - 2023
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An object is mounted on a wall. Its image of equal size is to be obtained on a parallel wall with the help of a convex lens placed between these walls. The lens is kept at distance $$x$$ in front of the second wall. The required focal length of the lens will be:
 1 less than $$\frac x4$$ 2 more than $$\frac x4$$ but less than $$\frac x2$$ 3 $$\frac x2$$ 4 $$\frac x4$$
Subtopic:  Refraction at Curved Surface |
62%
From NCERT
NEET - 2023
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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:  Lenses |
71%
From NCERT
NEET - 2022
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

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:  Refraction at Plane Surface |
60%
From NCERT
NEET - 2022
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

Two transparent media $$\mathrm{A}$$ and $$\mathrm{B}$$ are separated by a plane boundary. The speed of light in those media are $$1.5\times 10^{8}$$ m/s and $$2.0\times 10^{8}$$ m/s, respectively. The critical angle for a ray of light for these two media is:
 1 $$\mathrm{tan^{-1}}$$($$0.750$$) 2 $$\mathrm{sin^{-1}}$$($$0.500$$) 3 $$\mathrm{sin^{-1}}$$($$0.750$$) 4 $$\mathrm{tan^{-1}}$$($$0.500$$)
Subtopic:  Total Internal Reflection |
78%
From NCERT
NEET - 2022
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh