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8K LIGHT. Optical Illusions. Which is darker A or B?. Black spots appear at the intersections. The grey centre bar is the same shade everywhere! - Watch. Move your head forwards and backwards while looking at the black dot. What appears to happen?.

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Presentation Transcript
slide29
What number is visible in the coloured circle? If you are colourblind you may see no number – like the grey image.
a dog in the snow1
A dog in the snow

Now can you see him?

light introduction
Light introduction
  • How does light travel?
  • Define:
    • Transparent
    • Translucent
    • Opaque
opacity
Opacity
  • http://www.ltscotland.org.uk/resources/s/light/opacity.asp?strReferringChannel=learningteachingandassessment&strReferringPageID=tcm:4-607879-64
luminosity
Luminosity
  • What does luminous mean?
  • Name 3 luminous objects.
  • Is the moon luminous? Explain.
plane mirrors
Plane mirrors
  • What happens to a ray of light when it hits a mirror?
  • What is the imaginary line at 90° to the mirror called?
  • What is the ray that goes to the mirror called?
  • What is the ray that goes away from the mirror called?
  • What is the rule for the angle of incidence and angle of reflection?
reflection plane mirror
ReflectionPlane mirror

Angle of reflection

Angle of incidence

Incident ray

Reflected ray

Normal

light through a glass block
Light through a glass block
  • What happens to light when it passes from air to glass or vice versa?
  • What is this called?
refraction
Refraction

Emergent ray

Normal

Normal

Incident ray

refraction1
Refraction
  • When light passes from air to glass the angle of incidence is ____________ than the angle of refraction.
  • When light passes from glass to air the angle of incidence is ____________ than the angle of refraction.
white light
White light
  • What colour is white light?
  • What happens when you shine white light through a prism?
  • Why does this happen?
light through a prism
Light through a prism
  • How many colours are produced when light passes through a prism?
  • What is this separation of colours called?
  • Which colour is refracted the most?
  • Which colour is refracted the least?
colours
Colours
  • What are the primary colours of light?
  • How can we get these colours
    • Magenta
    • Cyan
    • Yellow
colour mixing
Colour mixing

http://www.ltscotland.org.uk/resources/s/light/lighting.asp?strReferringChannel=learningteachingandassessment&strReferringPageID=tcm:4-607879-64

slide55

R

G

B

filters
Filters
  • What are colour filters?
  • Which word means the light passes through the filter?
  • Which word means the light does not pass through?
slide58

red

blue

screen

1. What colour(s) will be transmitted by the red filter?

Answer : red

2. What colour will we see on the screen?

Answer : black

3. Why?

Answer : the blue filter absorbs the red light.

slide59

green

blue

screen

1. What colour(s) will be transmitted by the green filter?

Answer : green

2. What colour will we see on the screen?

Answer : black

3. Why?

Answer : thebluefilter absorbs the green light.

slide60

yellow

red

screen

1. What colour(s) will be transmitted by the yellow filter?

Answer : green and red

2. What colour will we see on the screen?

Answer : red

3. Why?

Answer : the red filter absorbs the green light and transmits red light.

slide61

yellow

cyan

screen

1. What colour(s) will be transmitted by the yellow filter?

Answer : green and red

2. What colour will we see on the screen?

Answer : green

3. Why?

Answer : thecyan filter absorbs the redlight and transmits green light.

why we see colours
Why we see colours
  • Why do objects appear coloured in white light?
  • Explain what happens for a white object.
  • Explain what happens for a black object.
slide64

I think that the light is reflected by the object and goes to your eye.

I think that the light goes to your eye, then to the object.

slide65

How do we see coloured objects?

If the light from the lamp is white light, made up of seven colours. Why do we see it as red?

slide66

How do we see coloured objects?

Only red is reflected

Orange, yellow, green, blue, indigo and violet are absorbed

slide67

How do we see coloured objects?

All the colours are reflected

slide68

How do we see coloured objects?

All the colours are absorbed

slide69

white

Coloured objects in coloured light.

1.

red

In your exercise book . . .

- write the title and date

- draw and complete each diagram with the correct reflected colour

The first one is done for you.

Red

white

blue

red

2.

4.

3.

Blue

Cyan

Yellow

yellow

green

red

7.

5.

6.

Green

Red

Red

yellow

magenta

cyan

10.

8.

9.

Magenta

Blue

Yellow

filters1
Filters
  • http://www.ltscotland.org.uk/resources/s/light/filters.asp?strReferringChannel=learningteachingandassessment&strReferringPageID=tcm:4-607879-64
lenses
Lenses
  • What are thetwodifferenttypes of lenses? And whatdoeseachone do tothe light?
  • Where do we use lenses?