31.08.2014 Views

ASNT Level III- Visual & Optical Testing

My Level III Self Study Notes

My Level III Self Study Notes

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Wave Theory<br />

The wave theory of radiant energy was advocated by Christian Huygens and<br />

is based on these premises.<br />

1. Light results from the molecular vibration in luminous material.<br />

2. The vibrations are transmitted through the ether in wavelike movements<br />

(comparable to ripples in water).<br />

3. The vibrations act on the retina of the eye, stimulating the optic nerves to<br />

produce visual sensation.<br />

The velocity of a wave is the product of its wavelength and its frequency.<br />

Charlie Chong/ Fion Zhang

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!