Group Q Luminous Objects

how to see a non-luminous object
In order for us to see an object that is non-luminous, it must reflect some of the light it receives from a luminous source, such as the Sun. Most of the objects we see, such as cars, clouds or even the Moon, are not luminous; it is just that they reflect sunlight.Luminous objects are responsible for our vision.

what is a luminous object
A luminous object is one that gives off light. In other words, it glows (or shines) of its own accord. To be able to glow, the object must have its own source of energy. For example, a torch shines because of the energy stored in its batteries, whereas all stars shine using energy created by nuclear fusion in their cores. Both a torch and a star are considered to be luminous objects.In complete darkness we cannot see/distinguish the different objects around us.Human eye perceives the light reflecting from different objects to cause the sensation of vision.In order to reflect (bounce back, come back) from different objects, we must make the light to fall on the objects.Light is generated/emitted/produced/comes from only luminous objects. Thus luminous objects are responsible for our vision

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some examples of luminous objects.
Some examples of luminous objects are a burning candle, a light bulb, the sun and other stars, fluorescent materials and tube lights, among other things. Any object is considered luminous if it emits its own light, either through stored energy or energy supplied to the object, which contrasts with non-luminous objects such as the moon, wood, plastics and metals; these objects merely reflect light instead of providing their own.

Step 1: Moon reflects the sun light hence it is Non-luminous object.
Step 2: Metals only reflect the light which falls on them.
Step 3: Earth will not produce light.
Step 4: Candle burns and emits light on its own, hence candle is the luminous object.

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