# An air bubble in a glass slab with a refractive index $$1.5$$ (near-normal incidence) is $$5$$ cm deep when viewed from one surface and $$3$$ cm deep when viewed from the opposite surface. The thickness (in cm) of the slab is: 1.  $$8$$ 2. $$10$$ 3. $$12$$ 4. $$16$$

Subtopic:  Refraction at Plane Surface |
75%
From NCERT
NEET - 2016
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A person can see objects clearly only when they lie between $$50$$ cm and $$400$$ cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be:

 1 convex, $$+2.25$$ D 2 concave, $$-0.25$$ D 3 concave, $$-0.2$$ D 4 convex, $$+0.5$$ D
Subtopic:  Human Eye |
72%
From NCERT
NEET - 2016
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An astronomical refracting telescope will have large angular magnification and high angular resolution when it has an objective lens of:

 1 small focal length and large diameter. 2 large focal length and small diameter. 3 large focal length and large diameter. 4 small focal length and small diameter.

Subtopic:  Telescope |
59%
From NCERT
NEET - 2018
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An astronomical telescope has an objective and eyepiece of focal lengths $$40$$ cm and $$4$$ cm respectively. To view an object $$200$$ cm away from the objective, the lenses must be separated by a distance:
1. $$46.0$$ cm
2. $$50.0$$ cm
3. $$54.0$$ cm
4. $$37.3$$ cm

Subtopic:  Telescope |
64%
From NCERT
NEET - 2016
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Match the corresponding entries of Column-1 with Column-2. (Where $$m$$ is the magnification produced by the mirror)

 Column-1 Column-2 A. $$m= -2$$ I. convex mirror B. $$m= -\frac{1}{2}$$ II. concave mirror C. $$m= +2$$ III. real Image D. $$m= +\frac{1}{2}$$ IV. virtual Image
 A B C D 1. I & III I & IV I & II III & IV 2. I & IV II & III II & IV II & III 3. III & IV II & IV II & III I & IV 4. II & III II & III II & IV I & IV
Subtopic:  Reflection at Spherical Surface |
75%
From NCERT
NEET - 2016
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The angle of incidence for a ray of light at a refracting surface of a prism is $$45^{\circ}$$. The angle of the prism is $$60^{\circ}$$. If the ray suffers minimum deviation through the prism, the angle of minimum deviation and refractive index of the material of the prism respectively, are:

 1 $$45^{0},~\sqrt{2}$$ 2 $$30^{0},~\sqrt{2}$$ 3 $$30^{0},~\frac{1}{\sqrt{2}}$$ 4 $$45^{0},~\frac{1}{\sqrt{2}}$$
Subtopic:  Prisms |
79%
From NCERT
NEET - 2016
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A thin prism having refracting angle $$10^\circ$$ is made of glass of a refractive index $$1.42$$. This prism is combined with another thin prism of glass with a refractive index $$1.7$$. This combination produces dispersion without deviation. The refracting angle of the second prism should be:
1. $$6^{\circ}$$
2. $$8^{\circ}$$
3. $$10^{\circ}$$
4. $$4^{\circ}$$

Subtopic:  Prisms |
66%
From NCERT
NEET - 2017
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A beam of light from a source $$L$$ is incident normally on a plane mirror fixed at a certain distance $$x$$ from the source. The beam is reflected back as a spot on a scale placed just above the source $$L$$. When the mirror is rotated through a small angle $$\theta,$$ the spot of the light is found to move through a distance $$y$$ on the scale. The angle $$\theta$$ is given by:
1. $$\frac{y}{x}$$
2. $$\frac{x}{2y}$$
3. $$\frac{x}{y}$$
4. $$\frac{y}{2x}$$

Subtopic:  Reflection at Plane Surface |
54%
From NCERT
NEET - 2017
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An object is placed at a distance of $$40$$ cm from a concave mirror of a focal length of $$15$$ cm. If the object is displaced through a distance of $$20$$ cm towards the mirror, the displacement of the image will be:

 1 $$30$$ cm away from the mirror 2 $$36$$ cm away from the mirror 3 $$30$$ cm towards the mirror 4 $$36$$ cm towards the mirror

Subtopic:  Reflection at Spherical Surface |
74%
From NCERT
NEET - 2018
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The refractive index of the material of a prism is and the angle of the prism is $$30^\circ.$$ One of the two refracting surfaces of the prism is made a mirror inwards with a silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if the angle of incidence on the prism is:
1. $$60^\circ$$
2. $$45^\circ$$
3. $$30^\circ$$
4. zero

Subtopic:  Prisms |
71%
From NCERT
NEET - 2018
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