How Do We See

Q. How do we see objects around us?

1. Every object emits light toward our eyes.
2. Light reflects off our eyes and falls on the object.
3. The light from our eyes illuminates the object.
4. Light reflects off the object and reaches our eyes.

Q.

State whether the following statement is true or false : A student says that we can see an object because light from our eyes is reflected back by the object.

Q.

What can you see in a completely dark room ? If you switch on an electric bulb in this dark room as a light source, explain how you could now see : (a) the electric bulb. (b) a piece of white paper.

Q.

Why do objects appear black?

1. Only black colour is reflected by the object

2. All colours falling on it are reflected and are received by our eye

3. All colours are absorbed by the object and so we receive no colour i.e black

4. None of these

Q. How do we see object?

Q.

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

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

Q. We see objects around us because of light

1. dispersion
2. scattering
3. reflection

Q.

When viewed in green light, a flag that is red and green will appear to be :

1. Yellow

2. Green

3. Black

4. Black and green

Q.

Why do objects appear black?

1. none of these

2. only black colour is reflected by the object

3. all colours falling on it are reflected and are recieved by our eye

4. all colours are absorbed by the object and so we recieve no colour i.e black

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

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

Q.

Any light that gives a spectrum similar to that of sunlight is often referred to as

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

1. external
2. internal
3. infinite

Q. How do we see things around us? How do we see colors? Suppose you are in a room, which has four boxes - black, white, red and blue. If the room is illuminated by red light, what color will the boxes appear?

Q.

Can we make black light?

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

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

Q. Ray of white light strikes the surface of an object. If all the colours are reflected the surface would appear :

Q.

If the white colour light is falling on a blue coloured object then what colour is reflected back?

1. White

2. Blue

3. Black

4. Complementary of blue

Q.

How would a red coloured object look in a room with only blue coloured source of light?

1. red

2. blue

3. white

4. black

Q.

How do we see objects?

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

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

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

4. All of these

Q. A cyan colour light ray is passed through a blue filter. What is the colour of the light which comes out through the filter?

1. Green
2. Cyan
3. Yellow
4. Blue

Q. Clouds are white because of light scattering off of water droplets.

1. True
2. False

Q.

If the white colour light is falling on a blue coloured object then what colour is reflected back?

1. Complementary of blue

2. Black

3. White

4. Blue

Q. What is the colour seen at the outer edge of the rainbow?

Q.

How would a red coloured object look in a room with only blue coloured source of light?

1. Red

2. Blue

3. White

4. Black

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

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

Q.

If the white colour light is falling on a blue coloured object then what colour is reflected back?

1. White

2. Blue

3. Black

4. Complementry of blue

Q. The length of the shadow will be longest when the _________.
(A) Angle between the source of light and the object is 45°
(B) Source of light and the object are parallel to each other
(C) Source of light and the object are perpendicular to each other
(D) Angle between the source of light and the object is 60°

Q.

If the white colour light is falling on a blue coloured object then what colour is reflected back?

1. White

2. Blue

3. Black

4. Complementary of blue