Question

When the extended source of light is bigger than the opaque body the penumbra region is

• A. equal to the size of umbra region
• B. smaller than the size of umbra region
• C. bigger than the size of umbra region
• D. none of the above

Answer 1

The correct option is C

bigger than the size of umbra region

Explanation:

1. When the extended source of light is bigger than the opaque body the penumbra region is bigger than the size of umbra region.
2. A penumbra is that region around the umbra where the shadow is only partial, or imperfect.
3. An umbra is that part of the shadow where all of the light from the source is being blocked by the shadowing body

Correct answer is option C.