Question

An opaque material in which a shadow is formed is called umbra screen/penumbra/none of these​

Answer 1

Answer:

Lens

Explanation:

Shadow is a space when the light is blocked by an opaque object.

It is a part where light does not reach. Shadow is formed when an opaque object is placed in the path of light.

For shadow formation, there should be a source of light, an opaque object and a screen where the shadow