Light and Vision (Leaving Cert Physics): Flashcards

A form of energy

Cannot be created or destroyed, only converted

$c = 3 \times 10^8 \text{ m s}^{-1}$

In straight lines

Straight line showing direction of light travel

Light spreads outwards from a single point

Light rays come together at a single point

Rays travel in same direction, no spread/converge

Impossible

Objects that produce their own light

Sun, flames, LED bulbs

Don't produce own light, only reflect it

Moon, books, people

Object location, size, and shape