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:

Insecticides

Chemical substances used to kill insects, playing a critical role in pest control and agriculture.

Renewable Energy

Energy generated from natural processes that are continuously replenished, such as sunlight, wind, rain, tides, and geothermal heat.

Coal

Coal is a combustible black or brownish-black sedimentary rock used primarily as an energy source and for heating.

Oil

Triglyceride, usually of plant origin, that is composed of glycerol and three fatty acids and is liquid in consistency due to many unsaturated bonds in the hydrocarbon chains of the fatty acids.