Lateral Displacement

Q. An equilateral prism deviates a ray through 40° for two angles of incidence differing by 20°. The possible angles of incidence are

1. 40° and 60°
2. 50° and 70°
3. 35° and 55°
4. 30° and 50°

Q.

To a fish underwater, viewing obliquely a fisherman standing on the bank of a lake, the man looks

1. Taller than what he actually is

2. Shorter than what he actually is

3. The same height as he actually is

4. Depends on the obliquity

Q. Focal length of the lens depends on its surrounding medium. What happens, if we use a liquid as surrounding media of refractive index, equal to the refractive index of lens?

Q. The angle of incidence i and refraction r are equal in a transparent slab when the value of i is

1. 0 degree
2. 30 degree
3. 45 degree
4. 90 degree

Q. Why does white light disperse when passed through a glass prism ?

Q.

Which one of the following is the correct ray diagram showing the lateral displacement of a ray of light when it passes through a rectangular glass slab?

1. 

2. 

3. 

4. 

Q.

Does the depth of tank of water appear to change or remain the same when viewed normally from above?

Q. The angle between the emergent ray and incident ray when the light goes from air to glass slab is ____

1. $0^{\circ }$

2. ${45}^{\circ }$

3. ${60}^{\circ }$

4. ${90}^{\circ }$

Q. Why does light bends while travelling from one medium to another?

1. Velocity of light differs from one medium to another
2. None of these
3. Frequency of light differs from one medium to another
4. Amplitude of light differs from one medium to another

Q.

Does plasma has any refractive index ???

Q. A ray of light strikes the glass slab at an angle $40°$ with the surface of the slab. Then the angle of incidence will be ____$°$

1. 60
2. 50
3. 90
4. 40

Q. Which of the following will increase the lateral displacement of the path traced by a light ray in a rectangular slab?

1. Increase in refractive index
2. Decrease in refractive index
3. Decrease in the angle of incidence
4. All of the above

Q.

In the above figure, there are two glass slabs of same refractive index. Hence, AB will be parallel to EF.

1. True

2. False

Q. A ray AO is incident upon a smooth surface POQ and enters into a denser medium. It is refracted along OS, a normal ON is drawn perpendicular to the surface at O (the point of incidence), and the value of ∠AOP is 60°. Find the probable value of x.

1. 30°
2. 15°
3. 60°
4. 75°

Q.

A graph is plotted between the angle of deviation ( $\delta$) and angle of incidence ($i$) for a prism. The nearly correct graph is

1. 

2. 

3. 

4. 

Q. A light ray is incident along normal of AB as shown below. If the critical angle is ${60}^{\circ }$, the angle of the refracted ray is .

1. ${60}^{\circ }$
2. ${90}^{\circ }$
3. ${30}^{\circ }$

Q.

In the figure given below, choose the correct option?

1. $\angle r={30}^{\circ }$

2. $\angle r<{30}^{\circ }$

3. $AB\parallel CD$

4. $\angle r>{30}^{\circ }$

Q. A point object O is placed in front of a transparent slab at a distance x from its closer surface. It is seen from the other side fo the slab by light incident nearly normally to the slab. The thickness of the slab is t and its refractive index is $\mu .$ Show that the apparent shift in the position fo the object is independent of x and find its value.

1. $t(1+\frac{t}{\mu }),$
2. $t(2-\frac{t}{\mu }),$
3. $t(2+\frac{t}{\mu }),$
4. $t(1-\frac{t}{\mu }),$

Q. A ray of light is travelling from glass to air. (Refractive index of glass $=1.5$). The angle of incidence is ${50}^o$.The deviation of the ray is

1. $0^o$
2. 80${}^o$
3. $si{n}^{-1}\left[\frac{sin{50}^o}{1.5}\right]-{50}^o$
4. ${50}^o-si{n}^{-1}\left[\frac{sin{50}^o}{1.5}\right]$

Q. Assertion :When a ray of light travels from ice to water the refracted ray at the point of incidence bends towards the normal. Reason: The ray goes from rarer to denser medium.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Fill in the blanks with suitable words
A ray of light passes undeviated after refraction from a thin lens when it is incident at ____________.

Q. A ray of white light passes from medium 1 to medium 2.
Which of the following quantities of the refracted ray will differ from that of the incident ray?

1. Speed
2. Intensity
3. Frequency
4. Wavelength

Q.

A point object O is placed in front of a transparent slab at a distance x from its closer surface. It is seen from the other side fo the slab by light incident nearly normally to the slab. The thickness of the slab is t and its refractive index is $\mu .$ Show that the apparent shift in the position fo the object is independent of x and find its value.

1. $t(1+\frac{t}{\mu }),$

2. $t(1-\frac{t}{\mu }),$

3. $t(2-\frac{t}{\mu }),$

4. $t(2+\frac{t}{\mu }),$

Q.

The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown as A, B, C and D in figure. Which one of them is correct?

1. 

2. 

3. 

4. 

Q.

Angle of minimum deviation is equal to the angle of prism A of an equilateral glass prism. The angle of incidence at which minimum deviation will be obtained is

1. ${30}^{\circ }$

2. ${45}^{\circ }$

3. $si{n}^{-1}\left(\frac{2}{3}\right)$

4. ${60}^{\circ }$

Q. If $\hat{i}$ decrease a unit vector along incident light ray $\hat{r}$ a unit vector along refracted ray into a medium of refractive index $\mu$ and $\hat{n}$ unit vector normal to boundary of medium directed towards incident medium, then law of refraction is

1. $\hat{r}.\hat{n}=\mu (\hat{r}.\hat{n})$
2. $\hat{i}\times \hat{n}=\mu (\hat{n}\times \hat{r})$
3. $\hat{i}\times \hat{n}=\mu (\hat{r}\times \hat{n})$
4. $\mu (\hat{i}\times \hat{n})=\hat{r}\times \hat{n}$

Q. Fill in the blank spaces.

1. different path
2. same path
3. deviated path
4. cant say

Q. What are the factors on which lateral displacement through glass slab depends?

Q.

Two parallel rays are travelling in a medium of refractive index ${\mu }_1=\frac{4}{3}$. One of the rays passes through a parallel glass slab of thickness t and refractive index ${\mu }_2=\frac{3}{2}$. The path difference between the two rays due to the glass slab will be

1. $\frac{4t}{3}$

2. $\frac{3t}{2}$

3. $\frac{t}{8}$

4. $\frac{t}{6}$

Q. A point object O is placed in front of a transparent slab at a distance x from its closer surface. It is seen from the other side fo the slab by light incident nearly normally to the slab. The thickness of the slab is t and its refractive index is $\mu .$ Show that the apparent shift in the position fo the object is independent of x and find its value.

1. $t(1-\frac{t}{\mu }),$
2. $t(2+\frac{t}{\mu }),$
3. $t(1+\frac{t}{\mu }),$
4. $t(2-\frac{t}{\mu }),$