Please enable JavaScript.
Coggle requires JavaScript to display documents.
Light - Coggle Diagram
Light
Black Body Radiaion
A perfect black body is an object that basorbs all the radiaiton that hits its, no radiation is reflected or transmitted, it is also a perfect emmiter
All objects emite EM radiaiton, this radiaiton just isn't in the IR part of the spectrum
The intensity and distribution of the wavelengths emitted by an object depend on the objects temperature.
As the temperature of an object increases, the intensity of every emitted wavelength increases.
-
-
-
-
Real and Virtual Images
A real image is where the light from the object comes together to form an image on a screen, like the image formed on an eye's retina
A vitrual image is when the rays are diverigng, so the light looks like it is coming from a different place
-
Visible light
Specular reflection
-
When parallel rays of light are incident on a smooth, plane surfacem the reflected light rays will also be parallel
-
-
Colour spectrum
-
-
-
Filters
Filters let through different colours of light, and absorb all other colours
A green filter will transmit green light, and absorbs all other wavelenths
-
A translucent material will transmit some light, but scatter most of it
Absorbtion surfaces
Colour of an opaque object appears based on how the atoms at its surface respond to the light being shone on them
-
-
Lenses
Concave (virtual)
-
-
The principle focus of a concave lense is the point where rays hitting the lens parallels to the axis appear to come from, you can trace them back until they all appear to meet up at a point
-
-
Rules for concave lenses
An incident ray parallel to the axis refracts through the lens, and travels in line with the principle focus
-
-
Drawing ray diagrams
Concave lense
1) Draw a ray from the top of the object to the lense, parallel to the axis of the lense
-
3) The incident ray parallel to the axis is refracted so it appears to have come from the principal focus, draw a dotted line from the pinciple focus to the ray and then make the line solid
-
5) Mark where the refracted rays meet, that's the top of the image
Convex lense
-
-
3) The incident ray parallel to the axis is refracted thorugh the principle focus on the other sie of the lense, draw the refracted ray passign through it
-
-