A) are transverse waves and require a medium to travel.
B) are longitudinal waves and require a medium to travel.
C) are transverse waves and require no medium to travel,
D) are longitudinal waves and require no medium to travel.
Correct Answer: B
Solution :
Option [b] is correct Explanation: According to Huygens, light waves are longitudinal waves and require a material medium to travel. For this reason Huygens assumed the existence of a hypothetical medium called luminiferous ether.
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