Light and Its Properties

Q.

Which of the following is not a reason behind rainbow formation?

1. refraction

2. dispersion

3. reflection

4. scattering

Q. The shape of the shadow formed is same as that of the object implies that light travels in a _____ path.

1. curved
2. straight
3. spiral
4. zigzag

Q.

State the two conditions under which the path of a ray of light will deviate?

Q. When light paases through the rain drops it forms rainbow.
similarly Fog(at the morning) is also made of water droplets then when light passes through Fog why does it scaters, it should also form rainbow right?

Q.

Explain the formation of the rainbow after a shower. Can we expect to see a rainbow on a hot dry day?

Q. In the double rainbow, colour is on top of the secondary rainbow.

1. Blue
2. Violet
3. Indigo
4. Red

Q. A rainbow is formed due to the dispersion of sunlight by raindrops.

1. False
2. True

Q.

Rainbows are formed due to ________.

1. only the refraction of light by raindrops.

2. refraction, reflection and dispersion of light by raindrops.

3. reflection of light from rivers and ocean.

4. refraction andreflection of light by Clouds.

Q. A rainbow is formed due to the dispersion of sunlight by raindrops.

1. False
2. True

Q.

When the light ray is ___________ to the boundary between two medium, light does not bend.

1. normal

2. oblique

3. parallel

4. curved

Q. Are most objects around us luminous or non-luminous?

Q. If light traveled at the same speed in raindrops as it does in air, would we still have rainbows?

Q. Light can behave both as a wave and as an array of particles.

1. True
2. False

Q.

Find the value of $\sin {\theta }_1$ in the diagram given below.
Given:
$n_{glass}=1.5$

1. $\sqrt{2}$
2. $\frac{1}{\sqrt{2}}$
3. $\frac{\sqrt{3}}{2}$
4. $\frac{1}{\sqrt{3}}$

Q. How do we see any non-luminous objects around us?

1. Every object is a source of light and sends light to our eyes
2. All of these
3. Light from a source of light is reflected by the non-luminous object and falls on our eyes
4. Light from our eyes leaves and illuminates the objects

Q. Rainbows are formed due to:

1. refraction, reflection and dispersion of light by raindrops.
2. reflection of light from rivers and ocean.
3. refraction andreflection of light by clouds.
4. only the refraction of light by raindrops.

Q. To see a non-luminous object, light from an ____ source is required.

1. external
2. internal
3. infinite
4. None of the above

Q. Light is a form of energy.

1. True
2. False

Q. The shadow of a/an object will be more prominent than the shadow of a/an object under the same conditions.

1. opaque
2. translucent
3. light
4. heavy

Q. Find the right sequence of things that happen in the process of seeing an object.

1. Brain
2. Object
3. Eyes
4. Reflection
5. Light source

Q. A ray of light travelling in air is incident on the plane of a transparent medium. The angle of incidence is ${45}^{\circ }$ and that of refraction is ${30}^{\circ }$. Find the refractive index of the medium.

1. $\sqrt{2}$
2. $2$
3. $\frac{1}{\sqrt{2}}$
4. $1$

Q. A person standing on the land beside a river looks at a fish inside the water. The depth of the fish inside the water will appear ______________ to the person.
(Note that you are almost vertically above the fish)

1. closer than its actual depth
2. farther than its actual depth
3. same as its actual depth
4. exactly double of its actual depth

Q.

A light-ray behaves ________.

1. as a particle

2. as a wave

3. neither as particle nor a wave

4. both as a particle or a wave depending on the situation

Q. When a beam of light is projected, objects cast a shadow, while objects do not.

1. opaque
2. transparent
3. light
4. heavy