Click any card to flip and reveal the fact.
When light enters a denser medium it slows, causing it to bend toward the normal — this is refraction.
The crystalline lens in your eye is convex. It changes shape to focus near and far objects on the retina.
Inside every camera, a convex lens forms a real inverted image on the sensor — the software flips it.
Move it past the focal point and the image flips, shrinks, and becomes real — a screenable inverted picture.
No matter where the object is, a concave (diverging) lens always makes a virtual, erect, diminished image.
A convex lens focuses parallel sunlight to a point at F₂ — concentrating enough energy to ignite paper.
Galilean telescope combines a convex objective with a concave eyepiece for an erect, magnified image.
When an object sits exactly at F₁ of a convex lens, refracted rays leave parallel — image is at infinity.