Question

what technology has been developed using our knowledge of refraction?

Explanation:

Refraction is the bending of light as it passes from one medium to another. Lenses work based on refraction. In a convex lens, light rays converge, and in a concave lens, they diverge. Microscopes use multiple lenses (objective and eyepiece) to magnify small objects. The objective lens forms a magnified real image, and the eyepiece further magnifies this image. Telescopes also use lenses (refracting telescopes) or a combination of lenses and mirrors (some advanced ones) to gather and focus light from distant objects. The refraction in the lenses helps in forming clear and magnified images of celestial bodies. Cameras have lenses that refract light to form a focused image on the film or sensor. The lens adjusts (in some cameras) to focus on objects at different distances, using the principle of refraction to bend the light rays appropriately so that they converge at the right point (the film/sensor plane) to create a sharp image.

Answer:

Lenses in microscopes, telescopes, and cameras.