1675. Fabry-Perot Interferometer
This instrument is suitable for study of hyperfine structure of spectral lines and of Zeeman effect.
The metallic components of Fabry-Perot Interferometer are identic to those of the Michelson Interferometer above and it is therefore possible to convert into the other by changing the optical parts alone.

1676. Optical Bench
Optical Bench Twin Bar Senior Specifications
Bed: The bed is made from , twin precision round tracks held in strong supports with levelling screws. The bars are ot an ample cross section and one of the bar is graduated in mm.
Sliders Four sliders are machined Geometric fit on the tracks and are machined plane on the upper surface to ensure correct vertical fitting of the pillars. Two of the sliders are provided with the transverse lateral slow motion.
All the four sliders are provided with hollow pillars of uniform specifications to take a stem of 3/8" diameter.
Index Marks are provided on all the sliders on strips affixed to each slider in the same plane. The Optical Bench is provided with the following accessories which are inter changeable.
a) Universal Lens Holder,   1
b) Spring type Lens "       1
c) Centring Pins.             2
d) Candle Holder.            1
e) Prism Table                1

1677. Optical Bench Twin Bar
as described above One meter long.

1678. Optical Bench Twin Bar
as described above, 1½ meter long. With supporting bar.

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