Transcript
Lecture 16
Prisms
EXAM Next week
Prism2
2
2 2
/) / (
)( 1 )
(e
o
o o
qE tn
N m
ò òò
Angles
Minimum Deviation
At minimum deviation, the ray travels parallel to the base
\2 \2
2 2i t
2 t
sin2 2
m nsin
Real Example
Prism spectrometer
Resolving Power
Recall OPL=ns F
T
W
G BFT TW nb b
F W
G Bb
( )s n bFT TW n
s b n
Resolving Power cont
b
s b n
ddns b
d
sd
Rayleigh Criterion
d
/ )()( min b dn d
Resolving power: ( )min
dnbd
Example
What is the resolving power and minimum resolvable wavelengthDifference for a prism made of flint glass with a base of 5cm?
4 11.19 10n
x nm
( )min
dnbd
@550nm
Other prism types
Pellin-BrocaAbbe
Reflecting prisms
Right Angle
Dove
Penta