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How We See


  • How we see things is due to light reflecting into our eyes.
  • Luminous objects produce light =reflects off non luminous objects = reflected light goes into our eyes

Pinhole

    • camera =

simple

    • camera.

    • Light travels in a straight line from the object to the tracing paper screen through the pinhole.
    • As pinhole is small = only one ray gets in from each point on the object.
    • Image of the object is upside down and crossed over as the light rays cross over inside the camera.
    • Lenses = focus light = refracts light

Measuring Current and Potential Difference

  • Convex lens = bulges outwards = causes light rays to converge (move together ) to a focus
  • Human eye = cornea is a transparent window with convex shape = does most of the eyes focusing.
  • Convex lens behind the cornea = changes shape = focuses light from objects at varying distances
  • Iris = coloured part of the eye = controls the amount of light entering the eye
  • Retina = where images are formed = retina cells are photo-sensitive
  • Energy is carried by light waves
  • Absorber = anything which absorbs this energy
  • Energy is transferred to the absorber when energy hits it
  • Light waves hit retina cell = causes chemical and electrical changes = sends signals to brain
  • Digital camera = light causes sensor to generate an electrical charge = changes in charge read by computer = image

How long have you…? (present perfect 4) Exercises


 

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Use the information given to create questions beginning with ‘How long…?’

• It is snowing.

• The weather is shining.

• John and Kate are married.

• My brother has gone on holiday.

• My aunty and uncle live in Canada.

• My sister is a teacher.

• I work at the chemist.

• I’ve known Susan since I was a baby.

• Jonathan is learning to speak to Mandarin.

 

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Fill in the missing gaps in the sentences using the present perfect (=has/have + past participle)

• I have known Kate a long time.

• My brother has been playing the piano he was 11 years old.

• My mum and dad on holiday to America. They

gone since last Sunday.

• I Ben and Emma since primary school.

We to the same primary and secondary school.

• My sister learning to speak French because she
is going to France next month.

 

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Use the appropriate words in the missing gaps.

have you lived       lives      to

has been       works        have known

I have bought       have worked.

• My sister in Spain. She is studying Spanish

with her friend Rosie. I Rosie since I was 5.

• Spencer like with Jamie. They have worked

together for 2 years.

• How long in Australia?

• a new dress for prom.

• He to Thorpe park.

 

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Challenge: Create 4 of your own questions beginning with ‘How long……?’

1.

2.

3.

4.

 

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