A conventional glass prism (left) has little refractive ability for light at about 1000 nm, but NEC's photonic crystal (right) is considerably more effective.
(A conventional glass prism (left; has; little refractive ability for light at about 1000 nm) (NEC's photonic crystal (right; is; considerably more effective)
A conventional glass prism (left NEC's photonic crystal (right
has is
little refractive ability for light at about 1000 nm
considerably more effective