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Light and Optics

Across
The process that powers the sun
Distance from peak to peak on a wave
The type of radiation emitted by the sun
Fuel used to make a campfire
Opaque objects will either reflect or ... light
Electromagnetic waves arranged by wavelength
An arrow that shows the direction that light is travelling
The heated piece of an incandescent light bulb
Down
Light emitted by hot objects
The only electromagnetic wave seen by humans
The type of light that is more efficient than incandescence
An example of chemiluminescence
The colour with a longer wavelength than orange
The fastest thing made by man
Light emitted by unheated objects
What happens when light hits an opaque object
The acronym to remember the colours of the rainbow