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How do we see light
We only see light that travels into our eye brain, dont see light that doesnt enter our eyes
Ray Diagram and Light Ray
Ray diagrams show how light moves from object to eye
Light Rays are lines that show direction and path light travels
light can be…
absorbed, reflected or refracted
How we see colour
Colour depends on wavelengths reflected
black absorbs all
white reflects all
blue absorbs only blue and reflects rest
Transparent VS Translucent VS Opaque
Transparent - Light passes through easily, see through
Translucent - Some light passes through, some reflected/absorbed, appears foggy
Opaque - No light passes through, can’t see through
Plane Mirrors are
flat mirrors
Image VS Mirror VS Reflection
Image - Reproduction of object produced through use of light
Mirror - Any polished surface that exhibits reflection
Reflection - Bouncing back of light from any surface
Incident Ray VS Reflected Ray VS Normal
Incident Ray = Incoming ray that strikes surface
Reflected Ray = Ray that bounces off reflective surface
Normal = Imaginary line perpendicular to reflecting mirror surface, placed where incident ray hits mirror
Angle of Incidence VS Angle of reflection
Incidence Angle = Angle btwn incident ray and normal
Reflection Angle = Angle btwn reflected ray and normal
Laws of Reflection in Plane Mirrors
Angle of Incidence = Angle of Reflection
Incident Ray, Reflected Ray and Normal all lie in same plane
Specular VS Diffuse Reflection
Specular - Light reflects off smooth surface, in same ddirection
Diffuse - Light reflects off rough dull surface, in scattered and different directions
Image VS Virtual Image
Image - Reproduction of Object through use of light
Virtual Image - Image formed by light that does not come from image location, but appears to come from image
SALT
Size, Attitude, Location, Type
SALT: Plane Mirror
Same size, Upright (but appears backward), Behind mirror (same distance from it as object), Virtual Image
Curved Mirror
Mirror with single curvature. Concave (Converging) faces towards object, Convex (Diverging) faces away from object
What’s C, F, V, Principal Axis
C - Centre of Curvature where surface used to make mirror
F - Focus, midpoint btwn C and V
V - Vertex, where principal axis meets mirror
Principal Axis - Line through C and mirrors midpoint
Characteristic Rays of Concave
Parallel to surface reflects through focus
Passing through focus reflects parallel
Passing through C reflects back through it
Striking vertex reflects at same angle
SALT: Beyond C for Concave
Smaller, Inverted, Btwn C and F, Real
SALT: At C for Concave
Same size, Inverted, At C, Real
SALT: Btwn F and C
Larger, Inverted, Beyond C, Real
SALT: At F
No Image
SALT: Inside F
Larger, Upright, Behind mirror, Virtual
Convex Mirrors
curve outward from object
Characteristic Rays for Convex
Parrallel to Principal Axis reflects along line that intersects focus behind mirror
Ray going through on path to focus reflects off mirror parallel to principal axis
Ray going through on path to C reflects back through same line
Striking vertex reflects at same angle on opp side of principal axis
SALT: Convex Mirrors
Smaller, Upright, Behind Mirror, Virtual
Found by extending reflected ray as dotted line behind mirror
