Light Transmission Flashcards
How do colours transmit through filters and how does this action take place?
Explain the process.
1) When light passes through a coloured filter some wave lengths will pass through while some wavelengths (colours of light) will be absorbed. The colour we see through the filter is what is being transmitted.
2) An example of this is if you were to hold up a blue filter and shine yellow light or red light on it they would be absorbed, however if you were to shine white light or even blue light on a blue coloured filter, the blue wavelengths would emerge making us see objects through the filter appear as blue.
3) this happens because filters are usually made out of materials which absorb particular wavelengths due to their specific molecular structure only allowing some colours to pass through them
What is opaque?
Opaque is when no light can pass through at object which means you cant see through them at all, molecules or atoms are tightly packed together, which contributes to their opacity. This also means it is more likely due to the tight packing light will be absorbed. some examples of this are wood, hard fabric and metal.
What is transulecent
Transluecent materials allow SOME light to pass through but not all of it making it appears as foggy. This is because the light is scattered all over the object making it more blurry then clear. And example of this is thin paper or frosted glass
Transparent
In transparent materials it is arranged in such a way where ALL LIGHT is able to pass through with very little absorption and scattering allowing it to be very clear through the material. And example of this is clean water or glass
What is reflection of light on surface’s and how does it occur on coloured surfaces
When light hits a coloured surface the surface reflects certain wave lengths back (colours of light) while it absorbs certain specific colours.
What we see are due to the wavelengths being reflecting back. For example if there is a red apple it appears red as it reflects wave lengths and absorbs other wavelengths (such as green and blue) so we only see the colour which is reflected. Objects appear different colours because their molecule’s are structured to absorb certain wavelengths while reflecting other certain wavelengths. The reflection is what the human eye sees and perceives
How does light travel in terms of speed and direction:
Light does not need particles to be seen.
It travels in very high speed
Light travels in a straight line because its made up of electromatic waves which do not require air or water to travel through. This allows light to travel through space without resistance.
Why does light not need particles to be see?
Light does not need particles to be seen because, it is not made out of MAGNETIC waves but instead out of electromatgic waves which does not need anything to pass through or need a medium such as air/water or any solid material.
What are emmiters and can you give examples which produce light ?
Emmiters are any object which produce heat and light. There are many different kinds of emitters such as, thermal emitters, heat emitters, electromatic emitters and a light emitter . In this case we are looking at a light emitter which is something which produces and releases light such as: the sun, a light bulb or a firefly.
What are reflecters and give some examples which reflect light?
Reflecters are something which cannot PRODUCE their own light but instead can make light bounce of off it reflecting it back. Basically the opposite of emitting. Some examples of this are the moon and mirror.
How does the size of a light sorce affect the shadow of an object? ( small light sorce and bit object)
If there is a small light sorce and a big object the object will come across as vibrant and clear because all the light is blocked out. This action is called an umbra. This also happens as the small light sorce produces a beam which is more focused and accurate.
How does the size of a light sorce affect the shadow of an object. (If there is a big light and small object)
If there is a big light and small object the shadow will be fuzzy and unclear. This is because only SOME LIGHT IS blocked off not all. The inside of the shadow (umbra) will remain dark and clear where was the outter rim of the shadow ( penumbra) will be fuzzy and blurry making it less distinguashed
What is the difference between a umbra and punumbra in a shadow
The umbra is the darkest part of a shadow where the light source is completely blocked, creating a sharp shadow. The penumbra is the outer part of the shadow where some light is still visible, resulting in a softer, gradient effect. In short, the umbra is fully shaded, while the penumbra has some light.
How do colours form to be white?
Primary colours all mix creating white light (red+blue+green) they have to be combinded equally all with the same amounts. This is because each colours contributes part of the full spectrum of light which our eyes perceieves as white
What happens when an incident light ray travels towards the normal line
Refreactions occurs, the light ray bends towards the normal, this happens due to the change in light as it enters a new medium
Why does light travel at a high speed
Light travels at high speed because it is an electromagnetic wave that moves through a vacuum without a medium, reaching approximately 299,792 kilometers per second (about 186,282 miles per second) due to the massless nature of photons.
