Reflection%20

1
Reflection Lesson aims

• To investigate the angle of incidence and angle
  of reflection, and find the pattern
• To find out the rules about where the image is
  formed

2
Reflection Practical 1

• Set up your ray box and mirror
• Shine a ray at the mirror
• Mark the ray on your piece of paper
• Mark the reflected ray, and the normal
• Measure the angles
• Try again with different angles
• Draw pic in book, state the pattern you find

i
r
i is angle of incidence r is angle of reflection
3
Reflection Practical 2

• You need to set up the mirror with an object in
  front of it
• Now place another object behind the mirror where
  the image appears to be
• Draw the positions of the mirror, object and
  image in your book
• Can you find a pattern?

image
mirror
object
4
Reflection Notes

• The angle of incidence is equal to the angle of
  reflection (you need to be able to draw this with
  new situations!)
• The image is as far behind the mirror as the
  object is in front
• A line joining the object and the image goes
  through the mirror at 900
• The image in a mirror is upright, laterally
  inverted (swapped left to right) and virtual (not
  on a screen)

5
Pinhole Camera

• Copy this diagram into your books ready for next
  lesson

tinfoil
Greaseproof paper
Tin can
One small hole in the foil
Point the foil end at a Bunsen or candle
6
Pinhole camera ray diagram

• Copy this diagram ACCURATELY

The image is inverted (upside down), and real (on
a screen)
7
Pinhole camera extension

• Try two holes in the foil what happens?
• Try on large hole in the foil what happens?
• In both cases, write down what you see, and
  especially how this is different to the first
  experiment with only one small hole

8
Peppers Ghost