It allows us to see.
One reason 'Normal Light' has that name is because it is visible to us and useful to us in so many different ways
we need light to see we don't we will not be able to see thing around us
It helps us if we don't have light .
The useful energy of a light bulb is the light it emits, which is used for illumination. This is the intended function of the light bulb, as it allows us to see and perform tasks in dark environments.
so they can see , spastic.
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No. Part of the energy is wasted, mainly as heat.
banking is useful because it allow us to save money fro future,and so on
If you mean light that escapes from poorly directed lighting units, and so is not useful to us, it gets absorbed in surrounding structures, vegetation, trees, etc, and ultimately in dust in the atmosphere.
A light pen is a useful device for artists. A photosensitive cell is mounted at it's tip and so it is useful for drawing or any other work but the artist working on it feels freely and can draw as if he's using a sketch pencil used for drawing.So that is how light pen is useful for artists. by r.k (R.I.S)
Minerals are too important to us. They are useful for many purposes.
Visble light is very useful to humans and others as it enables us to see our way around during the day.