Light

16 April 2020

I am a bulb
I am a bulb
Can you imagine how dark this world will be without light? Well, we certainly can't see anything around us without light. 

Do you still remember a fish named cavefish? A type of fish that lives in the dark cave in the bottom of the ocean? This type of fish doesn't have eyes because its habitat is very dark and no light at all. So, if this world has no light we might not need our eyes either. 

So what is light? 
Light is a form of energy that made of photons that enables us to see around. Light has two types of sources which are natural and man-made. The Sun, lightning and the stars are our natural light sources while luminous objects such as candle, lantern, bulb are man-made. 

What about the moon? Is it a light source or not? 
The answer is NOT, because the moon only reflects light from the Sun that's why we can see it from the Earth. 

So, we can see things around us due to the reflection of light. Light travels in a straight line from the light sources then reflected into our eyes. Why then, we can see different colours of objects? The answer to this because light contains all the spectrum of colours (known as rainbow) and once they hit on the object they will absorb all the colours but only reflect the colour of the object. Therefore, we can see it in a certain colour. 
The reason we see colors
Take this blue box as an example, it looks blue because it is absorbing every colour except blue, which reflecting off and entering our eyes. That's why we see it in blue. 

But how does light travel? 
As you know that light comes from light sources. In order to reach objects and enter our eyes, it produces light rays which always travels in straight lines. When it hits an opaque object, some light is absorbed and the rest reflects off. This is the reason why we are unable to see through an opaque object. 

If the object is transparent, light rays pass through it easily. That is why you can see through your window because its made of glass which is transparent. 

However, if the object is translucent, some light can pass through and the rest will be reflected. For instance, when you wear sunglasses at noon, you will be able to see around yet not as clear as when you take off your glasses. Wow, amazing right? Now you understand why we can or can't see through objects. It's all about light.
I'm looking gorgeous today, source
Here is the interesting part,

Have you ever wondered why are you able too see yourself in front of the mirror but not in other objects? Well, this is because of  the surface. The smoother the surface, the clearer you see your reflection. Therefore, you cannot see yourself clearly over a wooden table, paper etc as they have different materials which are actually rough under a microscope. 

Despite that, can we measure the light intensity?   

In order to know how bright something is, you can measure the light intensity using a light meter and a light sensor with a data logger in the unit of lux. The bigger the number in lux, the brighter it is. 


To understand more about light, you may watch this video:


So that's the explanation of light, I hope that it can help you understand about it. 

Now, let's try this!
Now you understand that not all objects can produce light or called as light sources. Can you identify 3 light sources and 3 non-light sources in your home?. Please submit your answer in the following comment box!.

Your loyal Cap. Idaa 
Ciao

Learn Also :

37 comments

  1. Light source:lamp, torch,tv
    Non light source:book,door, clothes

    ReplyDelete
  2. (light source) non light source
    light bulb? table
    Led light? chair
    neon light? book(Rena

    ReplyDelete
  3. Light sources:Light bulb,flashlight,and TV. Non-Light sources:Couch, remote,and pillow.

    ReplyDelete
  4. Light source=Sun,bulb,torch
    Non-light source=door,chair,table
    ~HILMI 5A~

    ReplyDelete
  5. 3 light sources at my house:
    -light bulb
    -Television
    -Flashlight

    3 non-light sources at my house:
    -table
    -chair
    -blanket

    ReplyDelete
  6. light source:bulb,torch,and tv
    non-light source:book,fan,and toys

    ReplyDelete
    Replies
    1. Muh nayaka dzaki jagaditha
      In order how to know how something you can measure the light in tencint

      Delete
  7. Light sources
    Television
    Lamp
    Flashlight
    Non light source
    Pen
    Pencil
    Book
    -Arumi 5A-

    ReplyDelete
  8. Light source:
    Light bulb
    Television
    Sun
    Nom-light source:
    Table
    Book
    Paper

    ReplyDelete
  9. light source
    -lamp
    -lightbulb
    -flashlight

    non light source
    -blanket
    -bucket
    -table

    -Nufah 5A

    ReplyDelete
  10. Eli 5a
    Light sources:
    Bulb
    Fire
    Flashlight

    Non light sorce:
    Book
    Pencil
    Pen

    ReplyDelete
  11. Light source:tv,torch,light
    Non light:bed,pen,bag
    Gdys

    ReplyDelete
  12. Light source:sun,bulb & flashlight
    Non-light source:wall,pillow & book

    ReplyDelete
  13. 3 light source:
    Television
    light bulb
    flashlight
    3 non light source:
    book
    paper
    chair

    ReplyDelete
  14. 3 light source in my home
    -tv
    -bulb
    -torch
    ~bhumi~

    ReplyDelete
  15. 3 light source in my home
    -tv
    -bulb
    -torch
    ~bhumi~

    ReplyDelete
  16. Light source=sun light bulb flash light
    Non light source=chair book table

    ReplyDelete
  17. 3 light sources
    -light bulb
    -tv
    -flashlight
    3 non light sources
    -table
    -bed
    -chair

    ReplyDelete
  18. Light source
    Lamp flash light
    Non light source
    Table Wood
    -by Mellania-

    ReplyDelete
  19. Light only can reflect transparent object light can help us to see in the dark

    ReplyDelete
  20. Komang4A

    Can you imagine the word is dark so we nit light that can be bright

    ReplyDelete
  21. Light is veey important for our life and light can penetrat transparant material like glass,water.

    ReplyDelete
  22. Tsabit
    We use light for see street

    ReplyDelete
  23. Light sources= light bulb, flashlight, lamp

    Non light sourses=toys,table,paper

    ReplyDelete
  24. From=tasya
    Grade=4A
    1. Light source
    2.lamp
    Non light source
    Rubber chair
    Wooden table.
    I hope you read this ms ida

    ReplyDelete
  25. Asyraf
    Non light source=Toy, chair, pot
    Light source=bulp, flash light,lamp

    ReplyDelete
  26. Light can transparent if the object is transparent to

    Rafa4A

    ReplyDelete
  27. Light sources=lamp,sun,fire
    Non-light sources=table,bed,door
    By Hafizh

    ReplyDelete
  28. we need light so we can see if there is no light tthis world will be so dark

    ReplyDelete
  29. Light soures:Bulb, flash light,lamp
    Not light soures:Toy,Chair,table

    From:Richelle 4B

    ReplyDelete
  30. Samuel J.P. Sihombing:
    the light sources: bulbs, phone and laptop
    the non-light sources: wood cupboard, iron table and wood chair

    ReplyDelete
  31. Light only can trough transparent object light can help us to see in the dark

    ReplyDelete
  32. Name: Francis
    Light source
    -bulb
    -sun
    -lightning


    No -light source
    -table
    -door
    -shoe

    ReplyDelete
  33. Name :princessa rahadatul aisy
    Grade :5A

    Light sources :
    -fireflies
    -fire
    -flashlight

    Non-light sources :
    -wood
    -metal
    -box

    ReplyDelete

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