Light Waves II - SS3 Physics Past Questions and Answers - page 2

Optical instruments use the principles of light wave behaviour to manipulate and control the path of light. Some common examples of optical instruments include telescopes, microscopes, cameras, and lenses. Telescopes are used to observe and study celestial objects such as stars and planets, while microscopes are used to study small structures such as cells and microorganisms. Cameras use lenses and light-sensitive materials to capture images, and lenses are used in eyeglasses, contact lenses, and other vision correction devices.

The human eye is a complex optical instrument that uses the cornea and lens to focus light onto the retina, where photoreceptor cells convert the light into electrical signals that are transmitted to the brain. Common vision disorders include myopia (nearsightedness), hyperopia (farsightedness), astigmatism, and presbyopia. Treatments for these disorders include eyeglasses and contact lenses, and surgical procedures.