#concave #concave convex rule #convex #what is convex #what is concave #concave convex lenses eyes #bending of light #how light bends #why light bends #concave lens #convex lens #dr binocs #peekaboo kidz #concave and convex lenses #reflection of light #refraction of light #focal length #speed of light #the dr binocs show #dr binocs show #light bending #concave mirror #convex mirror #why does light bend #bending light #convex vs concave #concave vs convex #what is a lens