Waves Part 2 Flashcards
Explain the difference between speculator and diffuse light in reflection…
Specular reflection is light reflected from a smooth shiny surface eg- mirror, whereas diffuse reflection is reflected from rough surfaces that tend to reflect light in all directions e.g.- clothing and paper
Why does a yellow hat look yellow?
As the white light hits the yellow surface the light reflected is yellow, this is because red and green (that make yellow) are reflected and blue is absorbed.
Why does a white object look white?
It looks white because it reflects all of the colours
What colour is a mixture of red and blue?
Magenta
Why does a blue book look blue?
All the other colours are absorbed apart from blue as It is reflected
What would happen if I shon a white torch through a red filter?
Red light would come out the other side, this is because the red filter only allows red through, all the other colours on the spectrum are absorbed
What would happen if white light was shon through a red and green filter that were placed together?
The light would appear black because the red filter would only allow red light through and the green would only allow pure green though, this means the light passing through is blocked wouldn’t allow light through, therefore it would appear black
Which is more powerful; a lens with a shorter focal length or a lens with a longer focal length?
A shorter focal length
What are the properties of a converging lens?
The lines cross
Convex shape
If the object is far away the image looks upside down but if it’s close up it is magnified and upright
What are the properties of a diverging lens?
Lines get further apart Concave shape Virtual image Upright Everything's small
What is a real Image
It’s an image formed where the light rays are focused
What is a virtual image
Is an image from which the light rays appear to come but don’t actually come from the image e.g. Mirror
What are electromagnetic waves?
Transverse waves that travel at the same speed in a vacuum, they transfer energy from source to observer
Recall the main groupings of the continuous electromagnetic spectrum - in order
Radio waves Microwaves Infrared Visible spectrum Ultraviolet X rays Gamma rays
Describe the electromagnetic spectrum as…….
Continuous from radio waves to gamma rays and that the radiations within it can be grouped in order of decreasing wave length and increasing frequency
