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Asked by billyh98 to Rick on 19 Jun 2013.
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Rick Smith answered on 19 Jun 2013:
Well a laser is a special type of light, they can be any colour, from the colours we can see to the invisible ones like UV and infra red. There are also other types of light even further away from the colours we can see like microwaves, it is possible to make a microwave laser, we call these masers.
But there is no real fire laser as fire is burning gas and not a type of light. But certain types of laser could certainly heat an object up and even set it on fire potentially…
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Comments
dogblue11 commented on :
When we were making LED circuits, we saw that if you flash a red, blue and green light very, very quickly together, the light looks white. Why is this?
Becki commented on :
white light is made up of all the visible colours, so if you mix colours of light back together you should get white. You can try splitting white light by shining it through a glass prism onto a white wall…you should get a rainbow.
Colin commented on :
Becki is right – thoguh light (as it is seen by humans) can be broken down into 3 primary colours – red green and blue – this matches the colours the colour response of the special cells at the back of the eye – cones – which can dependant on design respond to red, green and blue. When all 3 are stimulated quickly enough it will appear white. We also have another effect going on in that we have what is known as the persistance of vision. The LEDs are flashing so quicklt that the eye and brain percieve them as being permanently on. Hence as far as the brain is concerned all the LEDs are on and it appears white!