Reflection And Refraction EOY9 Flashcards
(9 cards)
Do all waves obey the law of reflection?
Yes I=r
How do you investigate the refraction of light in a rectangular prism?
Place the glass block on a sheet of paper, and carefully draw around the rectangular perspex block using a pencil
Switch on the ray box and direct a beam of light at the side face of the block
Mark on the paper:
A point on the ray close to the ray box
The point where the ray enters the block
The point where the ray exits the block
A point on the exit light ray which is a distance of about 5 cm away from the block
Draw a dashed line normal (at right angles) to the outline of the block where the points are
Remove the block and join the points marked with three straight lines
Replace the block within its outline and repeat the above process for a ray striking the block at a different angle
Repeat the procedure for each shape of perspex block (prism and semi-circular)
Which way does the light bend when moving into the denser medium?
Towards the normal.
What happens to a wave when it goes through a medium at a right angle?
What causes refraction?
It is caused by waves speeding up (moving from more dense to less dense) and slowing down ( moving from less dense to more dense) as they pass over the boundaries.
Do all waves obey the law of reflection?
Yes I=r
What is dispersion?
Dispersion is the effect of white light being split in to the colour spectrum, typically by a triangular prism/rain drops
Why do things appear shallower in water?
Refraction occurs when light passes from one medium to another and changes speed, which causes it to change direction. In the case of water, the light bending makes objects look closer to the surface than they really are.
What are the order of the colours of the rainbow?
Red 🔴, orange 🟠, yellow 🟡, green 🟢, blue 🔵, indigo 👾, violets 🟣 🌈
