Convex vs Concave Lenses: Understanding the Key Differences

A convex lens and a concave lens differ in shape and how they affect light rays:

Convex Lens (Converging Lens):
Shape: Thicker in the middle, thinner at the edges.

Effect on Light: Converges (bends inward) parallel light rays to a focal point.

Image Formed: Can produce real or virtual images depending on the object's position.

Common Uses: Magnifying glasses, cameras, eyeglasses for farsightedness.

Concave Lens (Diverging Lens):
Shape: Thinner in the middle, thicker at the edges.

Effect on Light: Diverges (spreads out) parallel light rays as if they come from a focal point behind the lens.

Image Formed: Always forms a virtual, upright, and smaller image.

Common Uses: Eyeglasses for nearsightedness, peepholes in doors.
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