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The cutoff between visible and infrared light is usually said to be somewhere between 700 and 800nm. Why is silicon transparent to most infrared light but opaque to visible light?
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The cutoff between visible and infrared light is usually said to be somewhere between 700 and 800nm. Why is silicon transparent to most infrared light but opaque to visible light?

User Swetha Lakshmi
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Answer:

The infrared photon does not have greater energy as compare to visible rays so infrared rays pass through but due to greater energy than the gap visible rays could not hence silicon is transparent to infrared rays but silicon is opaque to visible rays .

User Nickponline
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