Edexcel A Level Physics:复习笔记5.25 Diffraction
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...
Edexcel A Level Physics:复习笔记5.24 Plane Polarisation
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...
Edexcel A Level Physics:复习笔记5.23 Magnification
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 ...
Edexcel A Level Physics:复习笔记5.22 The Lens Equation
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...
Edexcel A Level Physics:复习笔记5.21 Real & Virtual Images
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 ...
Edexcel A Level Physics:复习笔记5.20 Thin Lenses in Combination
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...
Edexcel A Level Physics:复习笔记5.19 Power of a Lens
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...
Edexcel A Level Physics:复习笔记5.18 Using Ray Diagrams
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...
Edexcel A Level Physics:复习笔记5.17 Converging & Diverging Lenses
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 ...
