Question

what will be the colour of Shadow of a colour object​

Answer 1

Answer:

the shadow is always black weather the colour of the object never matters for the shadow

Answer 2

Answer:

When you move the object close to the screen, the shadows overlap, leaving a very dark (black) shadow where the object blocks both lights. When you turn off the green light, leaving on the red and blue lights, the screen will appear to be magenta, a mixture of red and blue. The shadows will be red and blue.