Question

why does a fluorescent tube light doesn't cast a shadow?

don't say that it does cast a shadow but very faint .​

Answer 1

Explanation:

If you have a fluorescent tube, you can see that by holding a wide stick (maybe a cricket bat) parallel to the tube and close to the floor: now you will see a shadow as the tube is narrower in one direction. When you turn the bat 90°, so it is perpendicular to the tube, the shadow will be much less strong.

Answer 2

Explanation:

It does produce a shadow, but it is very faint and thus creates an illusion of no shadow. A point source of light casts a strong shadow.