Question

Which of the following are the two examples of non-luminous objects ?
A. stars, the moon
B. a burning candle, a glowing bulb
C. the moon, a spoon
D. stars, a spoon

Answer 1

Hint: Non-luminous objects are those objects which are visible from the light of luminous objects because they did not emit their own light.

Complete step-by-step answer:

Now as we know that luminous objects are those which generate their own light. But non-luminous light does not emit light. So, they are visible from the light of the sun.

Some non-luminous objects may appear to be shining or producing light when it actually is not like the moon.

Now we have to check all the given examples whether it is luminous or non-luminous.
So, as we all know that stars have their own light. So, stars are luminous objects.

Now moon is the non-luminous object because they appear shining but that light not of moon it reflects the light from sun.

A burning candle will be an example of a luminous object because it emits her own light.

A glowing bulb will also be an example of a luminous object because it shines from its own light.

Now as we know that spoon does not have any light. So, a spoon will be an example of a non-luminous object.

So, the moon and spoon are the examples of non-luminous objects.
Hence, the correct option will be C.

Note: Whenever we come up with this type of problem then we should remember that all objects that appear to be shiny are not luminous objects because some non-luminous objects also appear shiny by reflecting light from other luminous objects. Like the moon appearing shiny by reflecting light from the sun and moon is the non-luminous object.