The power of a biconvex lens is \(10\) dioptre and the radius of curvature of each surface is \(10\) cm. The refractive index of the material of the lens is:
1. \( \frac{4}{3} \)
2. \( \frac{9}{8} \)
3. \( \frac{5}{3} \)
4. \( \frac{3}{2}\)

Subtopic:  Lenses |
 74%
From NCERT
NEET - 2020
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If the critical angle for total internal reflection from a medium to vacuum is \(45^{\circ}\), the velocity of light in the medium is: 

1. \(1.5\times10^{8}~\text{m/s}\) 2. \(\frac{3}{\sqrt{2}}\times10^{8}~\text{m/s}\)
3. \(\sqrt{2}\times10^{8}~\text{m/s}\) 4. \(3\times10^{8}~\text{m/s}\)

Subtopic:  Total Internal Reflection |
 81%
From NCERT
NEET - 2020
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An object is placed on the principal axis of a concave mirror at a distance of \(1.5f\) (\(f\) is the focal length). The image will be at:

1. \(-3f\) 2. \(1.5f\)
3. \(-1.5f\) 4. \(3f\)
Subtopic:  Reflection at Spherical Surface |
 67%
From NCERT
NEET - 2020
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A plane-convex lens of unknown material and unknown focal length is given. With the help of a spherometer, we can measure the

1. focal length of the lens.
2. radius of curvature of the curved surface.
3. aperture of the lens.
4. refractive index of the material.

Subtopic:  Lenses |
 62%
From NCERT
NEET - 2020
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Find the value of the angle of emergence from the prism given below for the incidence ray shown. The refractive index of the glass is \(\sqrt{3}\).

       

1. \(45^{\circ}\)
2. \(90^{\circ}\)
3. \(60^{\circ}\)
4. \(30^{\circ}\)

Subtopic:  Prisms |
 55%
From NCERT
NEET - 2021
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A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since:

1. a large aperture contributes to the quality and visibility of the images.
2. a large area of the objective ensures better light-gathering power.
3. a large aperture provides a better resolution.
4. all of the above.

Subtopic:  Telescope |
 78%
From NCERT
NEET - 2021
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A point object is placed at a distance of  \(60~\text{cm}\) from a convex lens of focal length \(30~\text{cm}\). If a plane mirror were put perpendicular to the principal axis of the lens and at a distance of \(40~\text{cm}\) from it, the final image would be formed at a distance of:

 

1. \(30~\text{cm}\) from the plane mirror, it would be a virtual image.
2. \(20~\text{cm}\) from the plane mirror, it would be a virtual image.
3. \(20~\text{cm}\) from the lens, it would be a real image.
4. \(30~\text{cm}\) from the lens, it would be a real image.

Subtopic:  Lenses |
 57%
From NCERT
NEET - 2021
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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
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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 |
 59%
From NCERT
NEET - 2022
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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
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