Download - Light detailed work v1
LIGHT AND COLOUR
http://micro.magnet.fsu.edu/primer/java/reflection/index.html
LINK TO INTERACTIVE SITE – CLICK HERE
Angle of incidence = angle of reflection
THE LAW OF REFLECTION
• The angle of incidence is equal to the angle of reflection.
• The image in a plane mirror is virtual and is the same size as the object.
• Plane mirrors are used in periscopes.
• They are used in rear view mirrors.
• The image is as far behind the mirror is as the object is in front.
• Image is laterally inverted
PERISCOPES
Shiny smooth surfaces reflect regularly, other surfaces also reflect light but if the surface is rough the light is reflected in all directions. We call this diffuse reflection.
Diffuse Reflection
CONVEX AND CONCAVE MIRRORS
http://micro.magnet.fsu.edu/primer/java/mirrors/concave.html
Convex and Concave Mirrors
•A concave mirror is a converging mirror. Parallel rays of light are reflected through the focal point of a concave mirror.•A convex mirror is a diverging mirror. Parallel rays of light are reflected so that they appear to come from the focal point of a convex mirror.
Molecular Expressions Microscopy Primer: Light and Color - Concave Mirrors: Interactive Java Tutorialhttp://micro.magnet.fsu.edu/primer/java/mirrors/convex.html
Uses of Concave Mirrors• Used to collect light energy,
sound, heat, radiation, radar and TV signals.
• If you move close to a concave mirror, then you see a magnified image of yourself. This image is upright and virtual as well as magnified. Shaving and make up mirrors
Uses of Convex Mirrors• They always produce virtual
upright images. • The image is always smaller than
the object.• They are useful when you want a
wide field of view – car driving mirrors or shop security.
• This is the bending of light rays• Happens because the rays change
speed.• When they enter a more dense
medium (glass, water,) they slow down.
• When they enter a less dense medium – like air, they speed up.
http://micro.magnet.fsu.edu/primer/java/refraction/index.html
http://micro.magnet.fsu.edu/primer/java/variablelens/index.html
Total internal reflectionand refraction
• When an object is viewed through water the image we see is changed because of the way light waves behave as they pass from the water into the air.
CLICK HERE FOR INTERACTIVE SITE http://micro.magnet.fsu.edu/primer/java/refraction/fishtank/index.html
White light is made up of the seven colours of the rainbow.
Red, orange, yellow, green, blue, indigo, and violet.
Molecular Expressions Microscopy Primer: Light and Color - Refraction of Light
Molecular Expressions Microscopy Primer: - Light and Color - Additive Primary Colors
Molecular Expressions Microscopy Primer: Light and Color - Subtractive Colors
How We See Colour
• We see colours because those are refelected off and object. Yellow light is refelected to our eyes but the other colours are absorbed so we see yellow.
RAINBOWS• We see rainbows because
the light is first refracted by the raindrop and then reflected off the back of the raindrop.
MIXING COLOURS• When we mix the three primary
colours of light we get white light. RED GREEN BLUE
• If we mix the three secondary colours of light we get black CYAN MAGENTA YELLOW
Molecular Expressions Microscopy Primer: Light and Color - Color Filters: Interactive Java Tutorial
In white light in red light in green light in blue light this is what the grapes and card will look like
In these glasses only light perpendicular to the highway is allowed through. This halves the amount of light reachingthe eye.
THE EYE
• The pupil allows light to enter the eye.• The lens helps to focus the light• Light sensitive cells in the retina detect the
light.• A nerve impulse travels from the retina to
the brain along the optic nerve where it is interpreted.
• The iris helps to change the size of the pupil
Molecular Expressions Microscopy Primer: Light and Color - Human Vision: Interactive Java Tutorial
http://cse.ssl.berkeley.edu/light/program.html
CLICK HERE TO INVESTIGATE REFRACTION IN A PRISM http://micro.magnet.fsu.edu/primer/java/prismsandbeamsplitters/equilateralprism/index.html