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

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

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

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)

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

Pinhole camera ray diagram Copy this diagram ACCURATELY The image is inverted (upside down), and real (on a screen)

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

Pepper’s Ghost