How do we see objects

Q.

What do you mean by luminous and non-luminous objects? Give examples. [3 MARKS]

Q.

What are non-luminous objects? Give two examples. [2 MARKS]

Q.

The objects that emit their own light are called as ___.

1. Luminous
2. Opaque
3. Transparent
4. Translucent

Q. Is moon luminous or non luminous?

Q. Is a led tv a luminous object?

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

1. False
2. True

Q.

Ray optics is valid when characteristic dimension are

1. much smaller than wavelength of light

2. of same order as wavelength of light

3. much larger than wavelength of light

4. none of the above

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

1. Glow worm
2. Firefly
3. Mirror
4. Sun

Q. Is smartphone a luminous object? If yes then why?
Anf if no then why?

Q.

A body which emits light by itself is called ___ .

Q.

___ objects emit light by itself.

Q.

Luminous objects emit light on their own.

1. True

2. False

Q.

What are the things required to see an object? [2 MARKS]

Q. Explain luminous and illuminated objects with examples

Q. Why does this hat appears as black?

1. It absorbs all the light
2. It reflects all the light
3. It reflects black light
4. It reflects black light

Q. Explain luminous and illuminated objects with examples

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.

Which of the following object(s) is/are luminous?

1. Table

2. Moon

3. Earth

4. Sun

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

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

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

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

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

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 best depicts how we see objects?

1. 
2. 
3. 
4. 

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

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

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

1. True
2. False