Describe the structure of compound eyes of cockroach

(a) Compound eyes of cockroach are large, black, kidney-shaped structure. .
(b) It is situated dorsolaterally on the head.
© Eye consists of about 2000 similar hexagonal units called ommatidium, each capable of forming an image.
(d) The eyes are covered externally with a transparent cuticle called the cornea. .
(e) Each ommatidium is composed of corneal lens, distal pigment cells around the pigment cone.
(f) It has retinule forming rhabdome and optic nerve.