These are the most frequently used words in this book.
angle
apparatus
area
axis
between
center
chapter
copper
curvature
cut
cutting
described
diameter
edge
end
equal
fig
figure
film
first
flame
flat
flux
focus
fringes
gives
glass
grating
greater
grinding
heat
heated
high
image
large
length
lens
light
line
making
may
means
mercury
metal
method
mirror
optical
parallel
parts
pitch
plate
point
polishing
pressure
prism
procedure
pump
radiation
removed
required
response
results
screw
second
should
shown
shows
side
silver
since
slit
small
soft
solution
source
spectrum
spherical
star
surface
table
telescope
temperature
test
three
time
together
tool
transmission
tube
tungsten
two
use
used
vacuum
water
wavelength
wire
work
yield
zones