Interaction with Parallel Beams
When multiple parallel rays of light (like sunlight) fall on spherical mirrors, they behave differently based on the shape of the mirror.
1. Concave Mirror: The Converging Mirror
A concave mirror reflects parallel rays such that they all meet (converge) at a single point called the Focus.
- This concentrates energy at one spot.
- Activity: If you hold a concave mirror towards the sun and focus the light on a piece of paper, the paper will burn! This is because the heat is concentrated.
2. Convex Mirror: The Diverging Mirror
A convex mirror reflects parallel rays such that they spread out (diverge). They appear to originate from a focal point behind the mirror.
Tip
Application: Solar concentrators use large concave mirrors to focus sunlight to heat liquids for generating electricity or melting metals.