Quick Answer: The Laser Accessory Set is a set of compatible items for investigating diffraction with slits, gratings, pinhole spots and other obstacles, together with lenses, an air cell, a glass scale and a ready prepared hologram.
Last updated: October 2026
Key Features
Three diffraction grating slides of 150 and 300 lines/mm
Pinhole slide, 50 mm square, with 0.2, 0.1 and 0.05 mm holes
Single and double slit slide, plus six slides with 1 to 6 slits
Six lenses of -100, -50, +50, +100, +200 and +1000 mm focal length, with 3 lens holders
Air cell for refractive index of gases, path length approx. 75 mm
Fresnel diffraction slide with circular obstacles, 6 bead headed mapping pins and a needle
Technical Specifications
Specification
Value
Grating slides
150 and 300 lines/mm
Pinhole sizes
0.2, 0.1 and 0.05 mm
Lens focal lengths
-100, -50, +50, +100, +200, +1000 mm
Air cell path length
75 mm approx.
Glass scale
200 x 25 x 6 mm, 0 to 150 mm x 1 mm
About This Product
The set also includes 2 microscope slides of 76 x 25 mm, a slide holder for 50 mm square slides, a glass scale with support stand, a ready prepared hologram and a copy of the Manual of School Laser Demonstrations. Together the items allow diffraction by slits, gratings, pinholes and obstacles, including Fresnel diffraction, to be investigated.
Frequently Asked Questions
Q1. What is the air cell used for? It is used to find the refractive index of gases and has a path length of approximately 75 mm.
