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Q.

Which of the following is the primary source of light?


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a

Sun

b

Flames

c

Mobile screen

d

All of the above 

answer is D.

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Detailed Solution

The primary source of light is the sun, flames and mobile screen.
The light sources that emit their own created light are known as primary sources of light. These light sources may have high or low temperatures depending on the primary conditions. Also, these sources make use of chemical or electrical processes to generate light. These sources of light can also have an ambient temperature which uses a chemical or electrical process to produce light like Tv and computers.
  
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