The Diffraction Grating Equation A?diffraction grating?is a plate on which there is a very large number of parallel, identical, close-spaced slits When?monochromatic light?is incident on a grating,...
Diffraction Diffraction is the?spreading out?of waves when they pass an obstruction Diffraction through a gap This obstruction is typically a narrow gap (a slit, or aperture) Diffraction is usually...
Plane Polarisation Transverse waves can oscillate in any plane perpendicular to the direction of motion (and energy transfer) of the wave Such waves are said to be?unpolarised Polarisation?occurs w...
Magnification Magnification as a Ratio of Heights Magnification means how much larger the image is than the object This is the ratio of the image/object height ?Where: m?= magnification hi?= image ...
The Lens Equation This equation can be applied to all?thin converging?and?diverging?lenses The equation relates the?focal length?of the lens to the?distances?from the?lens?to the?image?and the?obje...
Real & Virtual Images Real Images Are formed when light rays from a point on an object?pass through another point?in space The light rays are?really there Can be?formed on a screen Are seen in ...
Thin Lenses in Combination When?multiple lenses?are used in?series?(one after the other) this is called a?compound lens To find the?total power?of a compound lens, find the?sum of the powers?of the...
Power of a Lens The?power?of a lens is a measure of its ability to?refract?light The?more?refraction a lens causes, the?higher?its power The?power?of a lens measures how strongly it focuses the lig...
Using Ray Diagrams Describing images formed by lenses Images are described using three concepts They are either: Real?or?virtual Bigger?than, the?same size?as or?smaller?than the object Inverted?or...
