If evolution occurs through gradations, the critics say, how could it have created the separate parts of the eye -- the lens, the retina, the pupil, and so forth -- since none of these structures ...

like a 10-22mm or a 12-24mm lens. These superwides make eye-popping images out of cramped interiors. And they aren't big and heavy. Wildlife Expedition You are going on an African safari-style trip.

Draw a ray which passes from the object through the centre of the lens. Some ray diagrams may also show a third ray. Only the person using the magnifying glass can see the image. The image cannot ...