Download
1 / 18
180 likes | 456 Views
Light. Light is a form of energy. Crooke’s Radiometer proves light has energy. Turns in sunlight as the light heats the black side. Shadows. Light travels in a straight line. If something gets in its path the light is blocked. A shadow is formed. Eclipses.
E N D
Light is a form of energy Crooke’s Radiometer proves light has energy Turns in sunlight as the light heats the black side
Shadows • Light travels in a straight line. • If something gets in its path the light is blocked. • A shadow is formed.
Eclipses • Proves light travels in straight lines
Light on cards goes through if the cards are lined up. This also proves light travels in straight lines
Reflection Angle of incidence = Angle of reflection Normal Reflected ray Incident ray Angle of reflection Angle of incidence Flat Mirror
Image • Here in a plane mirror an image is formed by the eye • Can not appear on a screen d d
Refraction The fisherman sees the fish and tries to spear it Fisherman use a trident as light is bent at the surface
Light bends towards the normal Refraction through a glass block
Real and Apparent Depth • A pool appears shallower
Focal Point Focal Point Lenses Two types of lenses Converging Lens Diverging Lens
Dispersion • Breaking up of white light into it’s colours
High frequency, short wavelength Low frequency,long wavelength γ Electromagnetic spectrum Each type of radiation shown in the electromagnetic spectrum has a different wavelength and a different frequency: The higher the frequency of the wave, the greater its energy. This makes X-rays dangerous and radio waves safe
