Question

1. (a) What is meant by light energy?
(b) How do we see an object?
2. (a) By giving three examples define natural
sources of light.
(b) By giving three examples define artificial
sources of light.
3. (a) Define luminous object. Give examples also.
(b) Define non-luminous object and give
examples.
4. Why are the moon and the planets considered
as non-luminous objects?
5. By giving three examples define the following
terms:
(a) Transparent material (b) Translucent material
(c) Opaque material​

Answer 1

Explanation:

A)- Light energy is a form of energy and is expressed in joules. Light, in physics, is the electromagnetic radiation of any wavelength; nevertheless, the definition of light is sometimes restricted to a specific range of wavelength (about 400-700 nm) that is visible to an unaided human eye.

Answer 2

Answer:

1. (a) A form of energy consisting of particle-like photons with wavelike properties, and in which affects the physiology of organism, e.g. through sense of sight, photosynthesis, etc.