Light enters at an angle of incidence in a transparent rod of refractive index n. For what value of the refractive index of the material of the rod the light once entered into it will not leave it through its lateral face what so ever be the value of angle of incidence

(a) $n>\sqrt{2}$                        (b) $n=1$

(c) $n=1.1$                        (d) $n=1.3$

Concept Questions :-

Total internal reflection
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

One face of a rectangular glass plate 6 cm thick is silvered. An object held 8 cm in front of the first face, forms an image 10 cm behind the silvered face. The refractive index of the glass is [Consider that light ray returns back in the first medium]

(a) 0.4                     (b) 0.8

(c) 1.5                     (d) 1.6

Concept Questions :-

Refraction at plane surface
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Difficulty Level:

One side of a glass slab is silvered as shown. A ray of light is incident on the other side at angle of incidence of ${45}^{0}$. The Refractive index of glass is given as 1.5. The deviation of the ray of light from its initial path when it comes out of the slab is:

(a)   90o

(b)   180o

(c)   120o

(d)   45o

Concept Questions :-

Refraction at plane surface
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Two transparent slabs have the same thickness as shown. One is made of material A of refractive index 1.5. The other is made of two materials B and C with thickness in the ratio 1:2. The refractive index of C is 1.6. If a monochromatic parallel beam passing through the slabs has the same number of waves inside both, the refractive index of B is

(a)   1.1                                      (b)   1.2

(c)   1.3                                      (d)   1.4

Concept Questions :-

Refraction at plane surface
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The image of point P when viewed from the top of the slabs will be

(a)   2.0 cm above P

(b)   1.5 cm above P

(c)   2.0 cm below P

(d)   1 cm above P

Concept Questions :-

Refraction at plane surface
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Two point light sources are 24 cm apart. Where should a convex lens of focal length 9 cm be put in between them from one source so that the images of both the sources are formed at the same place?

(a)   6 cm                                   (b)   9 cm

(c)   12 cm                                (d)   15 cm

Concept Questions :-

Lenses
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Difficulty Level:

(a)   2R                                      (b)   R

(c)   $\frac{3}{2}R$                                 (d)  ${R}^{2}$

Concept Questions :-

Lensmakers' formula
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Difficulty Level:

A prism having an apex angle 4o and refraction index 1.5 is located in front of a vertical plane mirror as shown in the figure. Through what total angle is the ray deviated after reflection from the mirror?

(a)   176o

(b)   4o

(c)   178o

(d)   2o

Concept Questions :-

Prisms
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Difficulty Level:

A rectangular glass slab ABCD, of refractive index ${n}_{1}$, is immersed in water of the refractive index ${n}_{2}\left({n}_{1}>{n}_{2}\right)$. A ray of light is incident at the surface AB of the slab as shown. The maximum value of the angle of incidence ${\alpha }_{max}$, such that the ray comes out only from the other surface CD is given by

(a) ${\mathrm{sin}}^{-1}\left[\frac{{n}_{1}}{{n}_{2}}\mathrm{cos}\left({\mathrm{sin}}^{-1}\frac{{n}_{2}}{{n}_{1}}\right)\right]$                 (b) ${\mathrm{sin}}^{-1}\left[{n}_{1}\mathrm{cos}\left({\mathrm{sin}}^{-1}\frac{1}{{n}_{2}}\right)\right]$

(c) ${\mathrm{sin}}^{-1}\left(\frac{{n}_{1}}{{n}_{2}}\right)$                                      (d) ${\mathrm{sin}}^{-1}\left(\frac{{n}_{2}}{{n}_{1}}\right)$

Concept Questions :-

Total internal reflection
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

A rod of glass ($\upsilon$ = 1.5) and of square cross section is bent into the shape shown in the figure. A parallel beam of light falls on the plane flat surface A as shown in the figure. If d is the width of a side and R is the radius of circular arc then for what maximum value of $\frac{d}{R}$  light entering the glass slab through surface A emerges from the glass through B

(a)   1.5

(b)   0.5

(c)   1.3

(d)   None of these

Concept Questions :-

Total internal reflection