Quick Answer:The Optical Bench Ordinary is a dual-rod school optics bench with a millimetre scale, levelling feet and sliding riders, supplied with 2 lens/mirror holders, 2 optical needles and 1 light screen.
Last updated: 18 October 2026
Key Features
Dual-rod track for aligned mounting of components.
Millimetre scale with zero index.
Levelling screws on the support feet.
Sliding rider mounts for 10–12 mm rods included.
Comes with 2 lens/mirror holders, 2 optical needles and 1 light screen.
Technical Specifications
Specification
Value
Track
Dual rod
Scale
Millimetre, zero index
Supports
Feet with levelling screws
Riders
Sliding riders for 10–12 mm rods (included)
Holders
2 lens/mirror holders
Optical needles
2
Screen
1 light screen
How It Is Used
Lenses or mirrors, the object needle and the screen are set on riders along the bench and their positions read from the scale. Students locate images by parallax with the needles or on the screen, then use the distances to find focal lengths and check magnification with the lens and mirror formulae.
.jpg)