Angle of incidence=Angle of reflection
For example, if a light ray hits a surface at 25, it will be reflected at 25
1 of 20
What's specular reflection?
Reflection from a smooth, flat surface is called specular reflection. This type of reflection that happens with flat mirror, so the image appears to come from behind the mirror is upright and virtual..
2 of 20
What is diffuse reflection?
If a surface is rough, diffuse reflection happens. Instead of forming an image , the reflected light is scattered in all directions. The rough surface at different parts are at different angles.
3 of 20
What is refraction?
Its the change in direction of a wave at such a boundary such as a glass block.
4 of 20
Explain Refraction :)
Glass is denser* than air, so a light ray passing from air into glass slows down. If a ray meets the boundary at an angle to the normal, it bends towards the normal.
The Reverse is also true. A light ray speeds up as it passes from glass into air, and ben
5 of 20
What's important in a required practical?
Make and record the angles of incidence and the angles of refraction accuratly.
o measure and observe the angle of refraction
use appropriate apparatus and methods to measure to measure refraction and how it may be different for different substances.
6 of 20
The method to investigate refraction.
.
7 of 20
State the Dangers for Microwaves
Microwaves heat water so they can heat the water inside out cells or bodies. Heating cells can damage or kill them.
8 of 20
Uses for microwaves
Cooking for food
Satallite communication
mobile phone communication
Cooking food
to make thermal images by police
short range communication such as laptops, computers.
infrared cameras to detect people in the dark
short distances remote controls
11 of 20
Dangers Visible light
Blindness
12 of 20
Uses for visible light
To light up room and for us to see
13 of 20
Uses for ultra-violet
Disinfect water
To detect forged banknotes using uv light :)
detect security marks
14 of 20
Dangers for ultra-violet
Uv sunlight can damage skin cells so sunburn.
skin cancer
eye conditions
15 of 20
Uses for x-rays
Detect broken bones
detect luggage-look into objects
16 of 20
Dangers for x-rays
Mutation in the dna causing change in the body
Kills cells
cause cancer
17 of 20
Uses for radio
Long range communication e.g television or radio
communicating with ships broadcasting
18 of 20
Dangers for gamma rays
Mutation in dna
kill cells
cause cancer
19 of 20
Uses for Gamma Ray
Treat cancer
detect cancer
to sterilise equipment and food
in scanners to detect cancer
20 of 20
Other cards in this set
Card 2
Front
What's specular reflection?
Back
Reflection from a smooth, flat surface is called specular reflection. This type of reflection that happens with flat mirror, so the image appears to come from behind the mirror is upright and virtual..
Comments
No comments have yet been made