😮 amazing lens
Lenses are used to bend light to form an image. You have a lens in each eye, while telescopes and microscopes uses lenses to help us see things that are either too far away or too small to be visible.
👉What is a lens?
A lens is a transparent object that allows light to pass through it. Lenses can be curved on one or both sides. Lenses that curve inward are called concave. Lenses that curve outward are called convex.
When you look at an object, the light from it travels in straight lines to the lens of your eye. The lens focuses the light upside down onto the retina at the back of your eye.
Cells in the retina turn the image into an electrical message. This travels to your brain, which turns the picture the right way up. Depth effect in eyes If someone is near-sighted, distant objects look blurred. This is because the lens focuses light in front of the retina rather than thereon . If far-sighted, nearby objects are blurred, and light focuses behind the retina.
Glasses or contact lenses help the eye focus light in the right place. Lenses instant reaction There are muscles in the eye that help the lens change shape so you can change focus quickly to look at things that are near or far away. Other muscles around the iris control how much light enters the eye. Your pupils get bigger to allow more light in and help you see in dim conditions.
👉Application of lenses :
👍 Try yourself:
Magnifying glasses are simple convex lenses that make things look bigger.
Telescopes contain lenses that allow us to see things that are very far away.
Video projectors magnify images so they can be displayed on a screen.
Some cameras have a number of lenses to produce different effects.
👍 Try yourself:
👉Make a simple water lens. Put a piece of clearplastic over a magazine page and drip water onto it. Now look at the letters through the “lens.”