Refraction through a Glass Slab

Q. What's is a critical angle?

Q.

Why does Sun appear slightly oval shaped at morning and evening?

1. All the above.

2. The rays of light from the lower edges of Sun are refracted more.

3. The rays of light from upper edge of the sun have to pass maximum thickness.

4. Due to unequal bending of light.

Q. Optical fibre works on the principle of total internal reflection.

1. True
2. False

Q. The angle between the normal and the refracted ray is called

1. angle of incidence
2. angle of deviation
3. angle of refraction
4. angle of emergence

Q.

Total Internal reflection happens only when the light is traveling from an optically denser medium to an optically rarer medium.

1. False

2. True

Q. A ray of light from a denser medium strikes a rare medium at angle of incidence i as shown in the figure. The reflected and refracted rays make an angle of 90°with each other. The angles of reflection and refraction are r and r'. The critical angle between them is

(a) sin^-1(tanr)
(b) sin^-1(tani)
(c) sin^-1(tanr')
(d) tan^-1(tani)

(The figure has an incident ray , a reflected ray , a normal and a refracted ray all lying at the point of incidence and an angle of 90 degree btw reflected and refracted ray)

*(Sir/madam please send a detailed answer along with the explanation of the QUESTION)

Q. An empty test tube held obliquely in a jar containing water appears shining. Why?

1. Total internal reflection
2. Dispersion
3. Scattering
4. All of the above

Q.

When does Total Internal Reflection occur?

Q. In an optical fibre, light is guided through it because of ___ .

1. Total Internal Reflection
2. Diffraction
3. Refraction
4. 
   Reflection

Q.

In the case of refraction of light from a rectangular glass slab, if i is the angle of incidence and e is the angle of emergence, then

1. e = i

2. e < i

3. i $\ne$ e

4. e > i

Q. A ray of light strikes the surface of a rectangular glass block such that the angle of incidence in air is (i) 0°, (ii) 45°. In each case, draw diagram to show the path taken by the ray as it passes through the glass block and emerges from it.

Q.

What happens when a ray of light traveling from one optical medium to another optical medium strikes the surface of separation of the two mediums?

Q. Which among the following images show the correct path of a light ray while passing through a rectangular glass slab?

1. 
2. 
3. 
4. 

Q.

When travelling obliquely from one medium to another medium, the direction of propagation of light in the second medium?

1. none of these

2. remains same

3. changes

4. may change or remain same

Q.

When travelling obliquely from one optical medium to another optical medium, the direction of light rays in the second medium _____________.

1. remains same

2. changes

3. may change or remain same

4. reflects back

Q. What is meant by total internal reflection?

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.

If a ray of light doesn't enter rarer medium and reflects back to the denser medium. This phenomenon is called as:

1. Final internal reflection

2. Total internal reflection

3. Critical angle of reflection

4. Total internal refraction

Q. What is total internal reflection?

Q.

What is diffraction?

Q.

Why does a pencil partly immersed in water appears to be bent inside the water?

1. Glass tumbler creates an illusion and pencil appears displaced

2. Light does not travel in the same direction in all media

3. Pencil and water react and the light direction changes

4. None of these

Q.

At the interface of two transparent mediums, at the point of incidence, the incident ray, the refracted ray and the normal, all lie in_____.

1. Different plane

2. Same plane

3. Depends on the medium

4. Insufficient data

Q. Answer the following questions:
(a) What is total internal reflection?
(b) State two conditions necessary for the total internal reflection to occur.
(c) Draw diagrams to illustrate the total internal reflection.

Q.

PQ (Double arrow ray) and PR (Single arrow ray) are two light rays emerging from the object P as shown in the figure below:

Name the phenomenon that occurs if the angle of incidence (angle PQN) is increased still further.

1. Refraction

2. Dispersion

3. Critical Phenomenon

4. Total Internal Reflection

Q.

In the given figure, when light emerges from the glass slab, the light ray bends ___

1. right of normal AB

2. on the normal AB

3. left of normal AB

4. cannot be determined

Q.

At the interface of two transparent mediums at the point of incidence, the incident ray, the refracted ray and the normal all lie in_____

1. Depends on the medium

2. Same plane

3. Different plane

4. Insufficient data

Q.

At the interface of two transparent mediums at the point of incidence, the incident ray, the refracted ray and the normal all lie in _____.

1. Different plane

2. Same plane

3. Depends on the medium

4. Insufficient data

Q.

The floor of the swimming pool looks shallower that what it really is. What phenomenon is responsible for this observation?

1. Reflection of light

2. Diffusion of light

3. Refraction of light

4. Eye defect

Q. Answer the following questions:
(a) What is total internal reflection?
(b) State two conditions necessary for the total internal reflection to occur.
(c) Draw diagrams to illustrate the total internal reflection.

Q.

A ray of light moves from a rare medium to a dense medium as shown in the diagram below. The ray or rays which represents the partially reflected ray is:

1. Ray 1 represent partially reflected ray

2. Ray 3 represent partially reflected ray

3. Ray 2 represent partially reflected ray

4. Ray 2 and 3 both represent partially reflected ray

5. Ray 1 and 2 represent partially reflected ray