A Light Ray in Air Enters and Passes Through a Block

question 37

Multiple Choice

A light ray in air enters and passes through a block of glass. What can be stated with regard to its speed after it emerges from the block?

• A) Speed is less than when in glass.
• B) Speed is same as that before it entered glass.
• C) Speed is same as that in glass.
• D) Speed is less than before it entered glass.

---

Definitions:

White Matter

A component of the central nervous system, primarily consisting of myelinated nerve fibers and responsible for communication between different brain regions.

Myelinated Axons

Axons that are encased in myelin, a fatty substance that speeds up the transmission of nerve impulses.

Ganglial Sheaths

Protective coverings around ganglia, which are clusters of nerve cell bodies in the peripheral nervous system.

Membrane Repolarization

The process of restoring the membrane potential of a cell to its resting state after depolarization.