Refraction

The refractive index of a liquid is 4/3. The critical angle for this liquid is
1. 48.59^o
2. 41.59^o
3. 0^o
4. 90^o
5. 41.45^o
The critical angle for a certain substance is 25^o.
The refractive index of this substance is
1. 2.4
2. 0.04
3. 1.3
4. 0.42
5. 1.5
The diagram shows a ray of light going from medium A into medium B. Which one of the following statements cannot be correct?
1. A is air and B is glass.
2. A is water and B is vacuum.
3. A is glass and B is vacuum.
4. A is water and B is air.
5. A is air and B is a vacuum.
In the following statements i and r represent the angles of incidence and refraction respectively, for light travelling from one medium into another.
Which one of the following statements is incorrect?
1. Sin i multiplied by sin r is constant
2. Sin i is proportional to sin r.
3. Sin i divided by sin r is constant.
4. Sin i>r divided by sin i is constant.
The real depth of a swimming pool is 2 metres.
Given that the refractive index of the water is 4/3, the apparent depth of the pool is
1. 1.2 metre
2. 2/3 metre
3. 0.75 metre
4. 4/3 metre
5. 8/3 metre
When a drinking straw is placed in a container of water so that it is partly submerged, it appears bent because of
1. refraction
2. total internal reflection
3. Snell's Law
4. lateral inversion
5. apparent depth
When light is going from a more dense to a less dense medium, the critical angle is the angle of incidence for which the angle of refraction is
1. 90^o
2. 42^o
3. 48^o
4. 51^o
A ray of light traveling in medium 1 strikes and travels into another transparent medium, medium 2.
If the speed of light is greater in medium 1, the ray will
1. refract towards the normal.
2. refract away from the normal.
3. undergo total internal reflection.
4. have an angle of incidence smaller than the angle of refraction.
The speed of light in a certain material is 50% of its speed in a vacuum. What is the refractive index of this material?
1. 0.5
2. 1.5
3. 6.0
4. 2.0
5. 1.5 × 10⁸
A ray of light is shone on a rectangular glass block as shown.
Which one of the emerging rays is correct?
1. C
2. A
3. B
4. D
A ray of light is shone on a rectangular glass block as shown.
Identify A, B and C.
1. A = Refracted ray, B = Incident ray, C = Normal
2. A = Incident ray, B = Refracted ray, C = Normal
3. A = Normal, B = Refracted ray, C = Incident ray
4. A = Refracted ray, B = Angle of incidence, C = Angle of refraction
A ray of light is shone on a rectangular glass block as shown.
Identify X, Y and Z.
1. X = Angle of incidence, Y = Emergent ray, Z = Angle of refraction
2. X = Angle of incidence, Y = Angle of refraction, Z = Emergent ray
3. X = Angle of Refraction, Y = Angle of incidence, Z = Emergent ray
4. X = Angle of reflection, Y = Angle of incidence, Z = Normal
The bending of a ray of light as it travels from one medium to another is called
1. refraction
2. reflection
3. deflection
4. total internal reflection
When a ray of light travels from a vacuum to a denser medium such as glass, it is refracted
1. towards the normal
2. away from the normal
Snell's Law is also known as
1. the second law of refraction
2. the first law of refraction
3. the second law of reflection
4. the first law of reflection
A ray of light travels from air into a glass block as shown. It makes an angle of 30^o degrees with the surface of the block.
If the refractive index of the glass is 1.5, what is the angle of refraction?
1. 35.26^o
2. 19.47^o
3. 1.30^o
4. 48.59^o
If the angle of incidence of a light ray passing through a pyrex block is 40^o, and the angle of refraction is 25.9^o, what is the refractive index of pyrex?
1. 1.47
2. 0.68
3. 0.85
4. 1.17
The refractive index between glass and water is 0.89.
What is the refractive index between water and glass?
1. 1.12
2. 62.87
3. 0.016
4. 0.11
The refractive index from air to glass is 1.5, and the refractive index of water is 1.33.
What is the refractive index from glass into water?
1. 0.89
2. 1.13
3. 2.00
4. 0.50
When light travels from a vacuum into a glass block, its speed
1. decreases
2. increases
3. stays the same
A boy observes a fish at a depth of 4 metres under the surface of a lake. If the refractive index of the water is 4/3, what is the apparent depth of the fish as seen by the boy?
1. 3 metres
2. 0.75 metres
3. 4 metres
4. 7 metres
A drone is flying directly above a swimming pool whose depth is 5 metres.
If the refractive index of the water is 1.33, what depth does the pool appear to be to the drone?
1. 3.76 metres
2. 6.65 metres
3. 6.33 metres
4. 1.24 metres
A group of students performed an experiment to determine the refractive index of crown glass. They obtained the graph shown.
What is the refractive index of this glass?
1. 1.6
2. 0.6
3. 0.95
4. 0.55
A group of students performed an experiment to determine the refractive index of perspex. They plotted a graph of sin i versus sin r.
Which one of the following diagrams were they most likely to have drawn?
In an experiment to determine the refractive index of water, a student arranged the apparatus as shown.
Identify the lengths A, B and C.
1. A = Real depth, B = Apparent depth, C = Apparent depth
2. A = Real depth, B = Real depth, C = Apparent depth
3. A = Apparent depth, B = Apparent depth, C = Real depth
4. A = Apparent depth, B = Real depth, C = Real depth
The speed of light in air is 3 × 10⁸ m/s.
What will be the speed of light in glycerine whose refractive index is 1.47?
1. 2.04 × 10⁸ m/s
2. 4.41 × 10⁸ m/s
3. 4.47 × 10⁸ m/s
4. 3 × 10⁸ m/s
The speed of light in ethanol is 2.21 × 10⁸ m/s.
What is its refractive index if the speed of light in air is 3 × 10⁸ m/s?
1. 1.36
2. 0.74
3. 1.52
4. 1.77
When light travels from a denser to a rarer medium, the angle of incidence whose corresponding angle of refraction is 90^o is called
1. the critical angle
2. the reflected angle
3. the obtuse angle
4. the acute angle
The refractive index for glass is 1.5.
Its critical angle is
1. 41.8^o
2. 90^o
3. 48.2^o
4. 30^o
The critical angle for sapphire is 34.4^o.
What is its refractive index?
1. 1.77
2. 0.57
3. 1.33
4. 1.52
A bundle of glass threads, each of which is capable of transmitting messages using light waves is called
1. an optic fibre
2. a microscope
3. a periscope
4. a convex lens
Which one of the following is not an advantage of optic fibres?
1. They are easy to install.
2. They are relatively cheap.
3. There is low power loss compared to copper cables.
4. They have a high capacity compared to copper.
5. They have a greater bandwidth compared to metal cables.
Which one of the following is an advantage of optic fibres?
1. They occupy less space than metal cables.
2. They can be split easily.
3. The signals travellng through them have to be boosted at intervals.
4. They are expensive to install.
A naturally occurring optical phenomenon in which light rays are bent to produce a displaced image of distant objects is called
1. a mirage
2. a virtual image
3. a reflection
4. a refractive index

Refraction

Multiple Choice Quiz