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Explain the following :A rock salt prism is used instead of a glass prism to obtain the infrared spectrum.

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Explanation:
The infrared spectrum can only be acquired with a rock salt prism because it does not absorb infrared radiations whereas a glass prism does.

Final Answer:
Hence, A rock salt prism is used instead of a glass prism to obtain the infrared spectrum because it does not absorb infrared radiations whereas a glass prism does.

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