Properties of Waves Properties of Waves
Reflection When light reflects off a mirror the angle of incidence always equals the angle of reflection Reflection
Reflection Reflection
Reflection Reflection
Reflection Reflection
This change in direction is known as refraction. When light enters a denser transparent substance it slows down and changes direction. This change in direction is known as refraction. Refraction
Refraction Refraction
Refraction Refraction
Refraction Refraction
Convex and Concave lenses Refraction
Different colours of light are refracted by different amounts. Dispersion When white light enters a prism it is split into a spectrum. This is known as dispersion Different colours of light are refracted by different amounts. Red light refracts the least, violet light refracts the most Dispersion
Dispersion Dispersion
Dispersion Dispersion
Reflected Colours Reflected Colours
Colour Filters Refraction
Total internal reflection When a ray of light travels from glass into air some of the light is reflected from the boundary 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. Optical fibres use total internal reflection Total internal reflection
Total internal reflection
Total internal reflection
Total internal reflection
Endoscope Endoscope
The closer the gap to the wavelength, the greater the diffraction Diffraction occurs when waves spread out after passing through a small gap. The closer the gap to the wavelength, the greater the diffraction Diffraction causes; sound to be heard in the shadow of buildings radio signals to be heard in the shadow of hills Diffraction
Diffraction Diffraction
Diffraction Diffraction
Diffraction Diffraction
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