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Question
The wavelength of I.R in infra-red instruments is about___________
Options:
A .  0.6 * 10⁻⁶ m
B .  1.0 * 10⁻⁶ m
C .  0.7 * 10⁻⁶ m
D .  0.9 * 10⁻⁶ m
Answer: Option D
Answer: (d).0.9 * 10⁻⁶ m
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