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...
Converging & Diverging Lenses A lens is a piece of equipment that forms an image by refracting light There are two types of lens: Convex Concave Convex Lenses In a convex lens, parallel ...
Measuring Refractive Index Aim of the Experiment To investigate the refraction of light through a perspex block Equipment Ray Box - to provide a narrow beam of light to refract through the perspex ...
Total Internal Reflection Total internal reflection (TIR) occurs when: The angle of incidence is greater than the critical angle and the incident refractive index n1 is greater than the refractive ...
Critical Angle As the angle of incidence is increased, the angle of refraction also increases until it gets to 90° When the angle of refraction is exactly 90° the light is refracted along the bound...
