Page 10 - WAVES
P. 10
The water acts as a lens to produce a pattern of
crest light from lamp bright and dark regions on a piece of white
paper placed under the tank when light passes
through it.
trough
Water waves have crests and troughs.
water Crest
the highest position of the wave acts as a
convex lens
Trough
the lowest position acts as a concave lens.
Light rays from the lamp on top will focus onto
screen the white screen below.
dark bright dark bright dark
Bright lines correspond to the crests.
Dark lines correspond to the trough.
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