Ray Model Of Light(Lower sec)

Ray Model Of Light 🛋 Thomas Edison knew what he was doing 💡 Light And Its BeamsLight is a form of energy.Types of beams: When light falls on a surface, it can be reflected, transmitted or absorbed. Types of Mirrors Types of mirrors 1. PlanemirrorsImage is:○ upright○ same size as the object○ virtual (cannot be formed on a screen)○ laterally inverted (right of image corresponds to left of objectand vice versa)

○ lies as far behind the mirror as the object is in front of themirror (image distance = object distance), eg. Dist. fromobject to mirror = 5cm →dist. from object to image = 10cm○ Representation of a plane mirror 2. Concavemirrors○ Curved surface that bends inwards (like a cave) eg. Front ofspoon○ Parallel light rays bounce off the curved surface and convergeat a focal point○ Object near the mirror →image upright and magnified○ Object further away from mirror →image inverted 3. Convexmirrors○ Curved surface that bends outwards (eg. Back of spoon)○ Parallel light rays spread apart after reflecting from the mirror■ As if coming from a focal point behind it○ Cover a wider field of vision○ Images formed are upright and diminished Plane Concave Convex Size Same size samesize/diminished/magnified diminished Upright/inverted? upright Upright/inverted upright

Location of image Same distance as objectdistance, behind themirror Varies, in front/behindthe mirror Varies, behind mirror Virtual/real? virtual Real/virtual virtual Spectrum Of LightDispersion of lightDaylight (or white light) is a mixture of different colours called aspectrum Spectrum: red, orange, yellow, green, blue, indigo and violet (ROYGBIV,aka ROY Gives Birth In Vietnam)When a spectrum of white light passes through a glass prism, the lightsplits up and disperses into a spectrum Prism bends or refracts each of the colour in white light by a differentangleRed rays travels the fastest through the prism and bends the leastViolet rays travel the slowest through the prism and bend the most

Second prism → can recombine the colours of the spectrum Reflection Reflection is formed when light rays bounce off a surface and enter our eyes Angles&Rays Lawsofreflection Angle of incidence is equal to angle of reflectionAngle i = angle r The incident ray, reflected ray and the normal at the point of incidence all lie inthe same plane (2D analogue that could consist of a line and 3D space)

RayDiagrams How to Draw:1. Locate the image positiona. Draw a dotted line from object O, perpendicular to themirror and extend the line into the mirror. IM = OM2. Draw the reflected raysa. Draw lines from the image to the eye. Draw dotted linesbehind the mirror and solid lines in front of the mirror(solid rays represent real rays)3. Draw the incident raysa. Draw lines from the object to the reflected rays on themirror RefractionDuetooptical densitydierence, thelight travelsat dierent speedindierenttypesof matter Use FAST to remember!!!

Exception: When looking parallel(90° )incident ray perpendicular to boundary of