Question

When we have an opaque object in front of a finite source, we get both an _______and ___________.

• A. Umbra
• B. Penumbra

Answer 1

1. When an opaque item is positioned in front of a light source, we get a shadow on the screen that is divided into two parts: a totally black inner section called the umbra and a partially lighted outside part called the penumbra.
2. When we have an opaque object in front of a finite source, we get both umbra and penumbra

Hence, when we have an opaque object in front of a finite source, we get both an umbra and penumbra.