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### Transcript of LIGHT AND COLOUR Spot the mistake Angle of incidence = angle of reflection.

• LIGHT AND COLOUR

• Spot the mistake

• Spot the mistake

• Angle of incidence = angle of reflection

• Most things reflect light in all directions, scattering light unevenly. A plane mirror is a flat mirror and reflects light evenly.

• Diffuse Reflection

• PracticalPredict which letters of the word ALPHABET looked at from the side in a mirror. Test out your predictionWhen you look at your self in the mirror what is different to how another person sees you.

• PracticalPut a pencil behind the mirror. Place another one in front of the mirror and match the reflection with the pencil behind the mirror. Predict the distance each will be from the mirror. Measure the distance of both pencils from the mirror.

• PracticalUse a ray box on a sheet of white paper of light to shine on to a concave mirror. Draw the rays coming off the mirror.

Repeat using a convex mirror.

• Copy the diagram

• THE LAW OF REFLECTIONThe 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

• CONVEX AND CONCAVE MIRRORS

• http://micro.magnet.fsu.edu/primer/java/mirrors/concave.html

• Convex and Concave MirrorsA 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 MirrorsUsed 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 MirrorsThey 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.

• THE EYEThe pupil allows light to enter the eye.The lens helps to focus the lightLight 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

• PERISCOPES

Students to draw an example in their books*