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Polaroid pair two in one with scale
For optical experiments -one polarizer is fixed & the
other can be rotated having aperture 25 mm & scale 75 mm brass graduated
with 360' x 1
<...
Polaroid pair two in one with scale
For optical experiments -one polarizer is fixed & the
other can be rotated having aperture 25 mm & scale 75 mm brass graduated
with 360' x 1
<...