A Light Ray in Air Enters and Passes Through a Block

question 6

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

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Definitions:

Groundwater Flow

The process by which water moves through the pore spaces or fractures in soils and rocks beneath the Earth's surface.

Water Table

The depth beneath the surface where the soil is completely filled with water.

Cave Roof

The upper surface or ceiling of a cave, formed by natural geological processes.

Sinkhole

A depression or hole in the ground caused by the collapse of a surface layer, often resulting from the dissolution of limestone by water.