EVERYDAY SCIENCE

Detailed explanation-1: -In a convex lens (sometimes called a positive lens), the glass (or plastic) surfaces bulge outwards in the center giving the classic lentil-like shape.

Detailed explanation-2: -A concave lens has two spherical surfaces bulging inward.

Detailed explanation-3: -A convex lens is thicker in the middle than it is at the edges. Parallel light rays that enter the lens converge . They come together at a point called the principal focus .

Detailed explanation-4: -A concave lens is also known as a diverging lens because it is shaped round inwards at the centre and bulges outwards through the edges, making the light diverge. They are used to treat myopia as they make faraway objects look smaller than they are.

Detailed explanation-5: -Convex lenses are thicker at the middle and therefore the rays of light that pass through the lens are brought closer together (they converge).