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Ch. 7 Looking At Light by Mind Map: Ch. 7 Looking At Light
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Ch. 7 Looking At Light

We will use this mind map to produce a study guide for the exam next Tuesday.

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If you have long-sightedness you are unable to see objects at a short distance.

7.9 light history

Aristotle-thought sound and light moved about in waves

Sir Isaac Newton-Newton found that light did shine through a vacuum. he claimed the light was made up of particles he called 'corpuscles'. Newton used his particle theory to explain why light reflected.his logic is that when these corpsuscles hit a surface,they simply bounced of like a tennis ball.

Thomas young-he became fascinated by the fact that the eye could create all colours just by looking at three diferent colours.

Evangelista Torricelli- succeeded in creating the vacuum.

7.1 Riding on a Light Beam







7.5 Improving your image



In optics, astigmatism is when an optical system has different foci for rays that propagate in two perpendicular planes. If an optical system with astigmatism is used to form an image of a cross, the vertical...


7.8 seeing in colour.


primary colours

secondary colours

colour in print.

7.4 Its the Image that Counts

Retina/ Eye Diagram

The Tree

Optic Nerve

The Iris/ Pupil

Getting Things In Focus

too close for comfort

summing up

when light meets a boundary between two different substances, it can be reflected, refracted or transmitted

you can see beams of light only when particles in substances like air scatter some of the light towards your eyes

Everything that you see is an image

when light travelsfrom water into the air, it bends away from the normal

a bioconvex lens is curved outwards on both sides. It converges light towards a point called a focus

when light travels from one substance into another, it changes speed and, unless it crossed the boundary at right angles, changes direction as well.

the action of the lens in obtaining a sharp image of the retina is called accomadation

A diverging lens spreads light out

if the combined focusing power of the lens and cornea is too weak for the length of the eye, images of nearby objects become blurry. this condition is commonly known as long sightedness

Most of the bending of light done by the human eye occurs at the cornea.

the total reflection of light when it travels from glass into air is called total internal reflection

Endoscopes, which include bundles of optic fibres, can be used to look in side the human body

the separation of white light in to its colours, called dispersion, occurs because different colours of light are bent by different amounts as they refract

Red, green and blue light can be combined together to produce white light

the colours yellow, magenta and cyan are used in printing, paints and dyes because they can be combined in different proportions to produce a wide range of colours including white

The receptor cells on the retina detect the brightness and colour of light. It is the cone cells that respond to colour

7.3 through the looking glass

Image - an iconic mental representation; "her imagination forced images upon her too awful to contemplate"

Diverging lens - a lens that causes parallel light rays to diverge.

Bioconcave - Having both sides concave

Converging Lens - A lens with a positive focal length which bends parallel rays of light toward a specific point, the focal point.

biconvex - convex on both sides, as a lens.

Focal - cause to converge on or toward a central point; "Focus the light on this image"

focal length - the distance from a focal point of a lens or mirror to the corresponding principal plane

Virtual focus -parallel beam focuses behind the mirror

7.6 Science & Technology

A Look inside

Communicating with visible light

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