Explanation that light is a form of energy that allows us to see. Physical processes - Light - What is light? Learning Points Light is a form of energy. Light travels in straight lines. Reflection occurs when light bounces off objects. Reflected light enters into the eye and enables us to see. A Twig Curriculum Film. Delivering key learning points. Get straight to the facts in just three minutes – directly linked to core learning, Twig's curriculum films will fit neatly into your lesson plans.