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How many bulbs can be connected in parallel

English: Incandescent light bulbs.

I need to know how many 15W bulbs can be connected in parallel If I use an extension cord in the 5A socket? If I use the 15 A socket then how many bulbs can I connect in parallel?

Asked Anil

Answer:

Assuming the voltage to be 220 V,

The current drawn by a single bulb is 15/220=0.068 A

So the no. of bulbs which can be connected in parallel = 5/.068=73 (avoiding the fractional part)

If you use 15A, then 220 bulbs can be connected. (follow the same procedure)

Light Amplification

If you passed directional light from a device such as a laser through the back of a 2 way mirror at a 45 degree angle and then directed that beam to 3 highly reflective mirrors at 45 degree angles in series so that the beam was directed back to the exact point it emerges from the two way mirror and creates an infinate loop what would happen?  Would the beam change color since the particles would be out of sync because of the time delay?  Would the light and heat of the beam amplify itself if the reflective surfaces were reflecting more than 50% of all the light emitted and more than 50% of the original sources light were transferred through the 2 way mirror?  I included a drawing to simpilify the questions.

 

Asked Jeff

refraction of light in water

A boy in a children's swimming pool.

Why when we look at the pool the image that we see is smaller than its real one .. i want to calculate this image . Given: n water = 1.33 , n air = 1 , OA = 30 cm ( OA is the real depth of the swimming pool ) i want to calculate OA’ ( the image that I’m seeing when standing beside the pool )

sanaa joumaa asked

 

Answer

Use the relation

refractive index = RD/AD

where is RD is Real Depth and AD is Apparent Depth

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