Waves

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How do we see everything around us?

Light, from the sun, reflects off the object into our eyes and then we can see it

why do you need to be careful using a laser beam

because it could damage your eyesight

how can u see the beam

use dust or a spray

how does light travel

as a transverse waves, in straight lines

shadow

when an object blocks a light source reflecting the shadows on a screen/floor

normal

an imaginary, dotted line drawn at 90 between the angle of incidence and the angle of reflection.

what is = in reflection

angle of incidence = angle of reflection

mirror

in a mirror ,virtual image, the rays appear from behind the mirror so the image appears to come from behind the mirror. The object stays the same size but is inverted.

absorbed

when light is taken into an opaque object and you cant see it.

Transmitted

when light goes through an object so you can see it

eg of absorbed

wallpaper

eg of transparent

window

translucent

light is transmitted an scattered

eg of translucent

frosted glass

refraction

changing the direction of light through an object

which is larger the angle of incidence or the angle o refraction

both, first the angle of incidence, the angle of refraction.

glass to air

refracted ray bends away from the normal

air to glass

refracted ray bends towards the normal

lenses

a lens is just a shaped piece glass. They can be concave or convex.

convex

enlarges object and when light refracts, light rays will all be focused on one point . Long sightness. Chunky one

concave

concave is not to magnify but diminishes things from far away. for short sightness. Skinny one

what uses convex lenses

glasses and contact lenses

rainbow

in a triangular prism, the refracted ray refracts a rainbow