This set of lenses, prisms and mirrors is intended for use with our RayZer Lightbox. The plastic lenses are 15mm thick. The base of each lens has been treated so that the passage of the beam can be clearly seen inside the plastic.The lens set comprises of:3 x prisms1 x rectangular block1 x circular block1 x semi-circular block1 x thin concave lens1 x wide concave lens1 x thin convex lens1 x wide convex lens2 x plane mirrors1 x concave/convex mirrorThe two plane mirrors enable reflection to be studied and the parabolic mirror is for demonstrating the focussing of the three parallel rays or turning it round the other way to show the diverging of the rays.This set should enable general basic school optics to be studied.The RayZer Lightbox is available to purchase separately (B8R07806).