The three glass lenses in the Optical Block Set  are useful for studying the reflection and refraction of light. The lenses are tinted on the bottom to allow the pathway of light to be seen more clearly.  Adult supervision is required.   

Semicircle lens dimensions: 
60 x 15 mm 

Trapezoid lens dimensions: 
75 x 40 x 15 mm 

Convex lens dimensions:  
60 x 20 x 15 mm

Materials: 
Crystal glass (tinted in the base)