(A) What Is the Difference Between an Illumination Edge and a Reflectance

question 10

Essay

(a) What is the difference between an illumination edge and a reflectance edge?
(b) Discuss what the "penumbra" demonstration and the "folded card" demonstration reveal about perception of these types of edges.

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Definitions:

Lacunae

Small cavities in bone or cartilage tissue that house cells (osteocytes, chondrocytes), providing them with space to reside and function.

Osteon

The spindle-shaped unit of bone composed of concentric layers of osteocytes organized around a central Haversian canal containing blood vessels and nerves.

Vertebrae

The series of small bones forming the backbone, in humans being 33 in number and providing support and flexibility.

Sacral

Relating to the sacrum, a large, triangular bone at the base of the spine that forms by the fusion of vertebral bones.