LIGHT ENERGY

CONTENT

• Review of the concepts of (i) Reflection (ii) Refraction of Light
• Apparent Depth and its Dangers to Swimmers
• Vision
• Dispersion and Rainbow

Introduction to Light Energy

Light is a form of energy. It enables us to see things when it is reflected from objects into our eyes. Objects that give light by themselves are called luminous objects. E.g. sun, while those that cannot give light but only reflect light from luminous objects are called non-luminous objects. E.g. moon.

Reflection of Light

Reflection is the sending back of rays of light after striking a reflecting surface. Reflection from a surface depends on how smooth or rough the surface is. A reflection from a smooth surface like a mirror is regular while that from rough surfaces like walls and stones is irregular or diffused.

Light Rays

Light ray is the pathway through which light travels.  Light rays could be incident (rays from the light source) and reflected rays (rays from the reflected object).