Optic Trough
It consists of acrylic rectangular trough with graduation from 0-58 cms. It consists of Lens holder (combination of single & double lens) mounted on one side of rectangular trough. A small screen with four wheels is also supplied with this instrument. Two semi conductors diode laser are mounted in such a way, so that we get two parallel beams of red laser. Supplied with diode laser power supply & two set of lenses.