How do we see objects

Q. We can see our image inside the mirror because:

1. light reflected by our body is reflected by mirror.
2. light reflected from source reaches our eyes.
3. our body is luminous object.
4. mirror is an opaque object.

Q. In a completely dark room, we can see our face in the mirror.

1. True
2. False

Q. Which of the following is not a necessary requirement to see an object?

1. Object
2. Eyes
3. Mirror
4. Light

Q.

How can we protect our eyes while looking at a strong source of light?

1. By using a mirror

2. By looking through a glass

3. By using paper

4. By using reflective glasses.

Q. Which of the following best depicts how we see objects?

1. 
2. 
3. 
4. 

Q. Optics is the study of properties and behaviour of light.

1. False
2. True

Q. The object that emits its own light is called object.

1. luminous
2. opaque
3. transparent
4. non-luminous

Q. Which of the following are sources of light?

1. Earth
2. Sun
3. Tubelight
4. Fire fly
5. Moon
6. Star
7. Bulb
8. Jupiter

Q. Which of the following is a non-luminous object?

1. 
   Candle
2. 
   Moon
3. 
   Bulb
4. 
   Sun

Q. The arms of a radium watch glows in dark. What kind of body is the arm?

1. Transparent object
2. Non-luminous object
3. Translucent object
4. Luminous object