Reflection of Light and How Do We See

Q.

What is a medium in terms of light?

Q. Bending of light rays as the light travels from one medium to another is called ___.

1. reflection
2. absorption
3. transmission
4. refraction

Q.

Light is a form of energy that causes the sensation of

1. hearing

2. smell.

3. sight

4. touch

Q.

Light travels with a speed of $2x{10}^{8}m{s}^{-1}$ in crown glass of refractive index $1.5$. The speed of light in dense flint glass having a refractive index of $1.8$ is

1. $1.33x{10}^{8}m{s}^{-1}$

2. $1.67x{10}^{8}m{s}^{-1}$

3. $2x{10}^{8}m{s}^{-1}$

4. $3x{10}^{8}m{s}^{-1}$

Q.

We can see objects due to ___ of light.

Q. Fish in the water appears to be raised to the person viewing from outside because of ___ of light.

1. reflection
2. refraction
3. dispersion
4. absorption

Q.

Light bends away from the normal when it travels from water to air.

1. True
2. False

Q. Refraction of light doesn't happen when the incident light ray strikes_________ to the boundary of two medium.

1. normal
2. parallel
3. opposite
4. curved

Q.

When light rays bounce off the surface of any object, the phenomenon is called the ___________of light.

Q.

Does the Light travel in the wavy lines ?

Q. Statement 1: A light ray travelling from a denser medium to a rarer medium bends away from the normal.
Statement 2: The speed of the light do not change as the light gets refracted.

1. Both the statements are true.
2. Statement 1 is true but statement 2 is false.
3. Statement 1 is false but statement 2 is true.
4. Both the statements are false.

Q.

Light obeys __________ propagation.

Q.

The reflection taking place on a rough surface, for e.g. a rock, is an example of ______

1. regular reflection

2. Refraction

3. irregular reflection

4. dispersion

Q.

Given that i is angle of incidence and r is angle of refraction for a light ray at a boundary, the correct expression for Snell's Law is:

1. $\sin i={\sin }^{2}r$

2. $\sin i=k\sin r$
   [where k = constant]

3. $\cos i=k\cos r$
   [k = constant]

4. $\sin r={\sin }^{2}i$

Q.

When a ray of light bounces back from a surface, we say it has been_________________.

Q.

Question 01
Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room? Explain.

Q. How do we know that when a ray of light is incident on still water it will get reflected or refracted.

Q.

The phenomenon of light hitting a surface and then bouncing off is termed as:-

1. Refraction

2. None of these

3. Reflection

4. Diffusion

Q.

Light can be thought of which of the following to explain its various properties?

1. Wave

2. Ray

3. Particle

4. All of these

Q.

Which of the following materials allows light to pass through it?

1. Transparent

2. Translucent

3. Both

4. None

Q. What is 'diffraction of light'?

Q.

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

1. Reflection of light

2. Diffusion of light

3. Refraction of light

4. Eye defect

Q. For a light ray passing from air to water, according to Snell's law:
($n$ represents refractive index of the medium, ${\theta }_{air}$ is the angle of incidence and ${\theta }_{water}$ is the angle of refraction)

1. $n_{air}$ $Sin{\theta }_{air}$ = $n_{water}$ $Sin{\theta }_{water}$
2. $n_{air}$ $Sin{\theta }_{water}$ = $n_{water}$ $Sin{\theta }_{air}$
3. $n_{air}$ $Sin{\theta }_{air}$ $n_{water}$ $Sin{\theta }_{water}$ = 1
4. $n_{air}$ $n_{water}$ = $Sin{\theta }_{water}$ $Sin{\theta }_{air}$

Q. What is the unit of refractive index?

1. m/s
2. m
3. It has no unit.
4. Hz

Q.

Which of the following best depicts how we see objects?

1. 

2. 

3. 

4. 

Q.

Light falling on a surface and going back in the same medium is an example of ____.

1. diffusion

2. reflection

3. refraction

4. scattering

Q.

The diagram shows a point source A inside a liquid container. Four rays P, Q, R and S starting from A are shown up to the water surface. Which of the following ray(s) will reflected inside the liquid?

1. Both AP and AQ

2. Both AR and AS

3. Both AQ and AS

4. AP

Q.

A ray of light passes from a denser medium to a rarer medium.

1. Bends towards the normal.

2. Bends away from the normal

3. Do not deviate.

Q.

How do we see objects?

1. Light from our eyes leaves and illuminates the objects.

2. Every object is a light source and sends light to our eyes

3. Light from a light source is reflected by the object and when these fall on our eyes we see the object

4. All of these

Q.

The following question contains two statements labeled ‘A’ and ‘R’. Examine each statement carefully and decide, if the assertion ‘A’ and reason ‘R’ are individually correct. If so, decide, whether the reason R is the correct explanation of A. Select your answer, using the options given below.

A No refraction of light takes place when the rays strike another medium at right angles.

R It is a special case of refraction of light.

1. Both ‘A’ and ‘R’ are correct and ‘R’ is the correct explanation of ‘A’

2. Both ‘A’ and ‘R’ are correct and ‘R’ is the not correct explanation of ‘A’

3. ‘A’ is correct, but ‘R’ is incorrect.

4. ‘A’ is incorrect, but ‘R’ is correct.