Properties of Waves Reflection 1 When light reflects

Properties of Waves

Reflection 1. When light reflects off a mirror the angle of incidence always equals the angle of reflection

Reflection

Reflection

Reflection

Refraction 1. When light enters a denser transparent substance it slows down and changes direction. 2. This change in direction is known as refraction.

Refraction

Refraction

Refraction

Convex and Concave lenses

Dispersion 1. When white light enters a prism it is split into a spectrum. This is known as dispersion 2. Different colours of light are refracted by different amounts. 3. Red light refracts the least, violet light refracts the most

Dispersion

Dispersion

Reflected Colours

Colour Filters

Total Internal Reflection 1. When a ray of light travels from glass into air some of the light is reflected from the boundary 2. If the angle of incidence is greater than the critical angle then all the light is reflected inside the glass. This is called Total Internal Reflection. 3. Optical fibres use total internal reflection

Total Internal Reflection

Total Internal Reflection

Total Internal Reflection

Endoscope

Diffraction 1. Diffraction occurs when waves spread out after passing through a small gap. 2. The closer the gap to the wavelength, the greater the diffraction 3. Diffraction causes; a) sound to be heard in the shadow of buildings b) radio signals to be heard in the shadow of hills

Diffraction

Diffraction

Diffraction

Quiz

Wordsearch