Concave lens
Definition
A concave lens is a lens that is thinner in the middle and thicker at the edges, causing light rays to diverge when passing through it.
Analogy
Imagine a spoon with its bowl facing upwards. The concave shape of the spoon's bowl represents the shape of a concave lens. Just like how the spoon curves inward, a concave lens curves inward as well.
Related terms
Convex lens: A convex lens is thicker in the middle and thinner at the edges, causing light rays to converge when passing through it.
Focal length: The focal length of a concave lens is the distance between the center of the lens and its focal point.
Virtual image: Unlike real images, virtual images formed by a concave lens cannot be projected onto a screen. They can only be seen by looking into the lens.
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