Question

by what percent does the light of the glowing bulb will decrease if we decrease the current flowing through it by 20%​

Answer 1

Answer:

Because every point on the Sun'ssurface is glowing with light, there's no way to deprive it of light by casting ashadow. Even if you put another source of light near the surface of thesun (for instance, a glowing filament as shown above), it doesn't change the fact that the main surface of the sun is still glowing.