Finished wood V-shaped slot holds lenses or mirrors up to 76mm diameter Holds convex or concave lenses or mirrors Index mark engraved on each end of the base 5" x 3.75" x 1.87" dimensions

Finished wood V-shaped slot holds lenses or mirrors up to 76mm diameter Holds convex or concave lenses or mirrors Index mark engraved on each end of the base 5" x 3.75" x 1.87" dimensions Finished wood V-shaped lens holder; fitting convex or concave lenses or mirrors up to 76mm in diameter. For use in demonstrating the principles of light and color. Lenses/mirrors not included.