Chapter 20: Q18P (page 526)
Explain how an optical fibre works. Why does the fibre still work when it is bent?
Short Answer
When the fibre is bent, theangle exceeds the critical angle, preventing light from leaving the core.
Chapter 20: Q18P (page 526)
Explain how an optical fibre works. Why does the fibre still work when it is bent?
When the fibre is bent, theangle exceeds the critical angle, preventing light from leaving the core.
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Get started for freeFind the minimum anglefor total reflection in the optical fiber in Figure 20-21 if the index of refraction of the cladding is 1.400 and the index of refraction of the core is
(a) 1.600 or
(b) 1.800.
What level of stray light gives an absorbance error of 0.01 at an absorbance of 2? That is, what value of Sgives an apparent absorbance of 1.99?
(a) The true absorbance of a sample is 1.500, but stray light reaches the detector. Find the apparent transmittance and apparent absorbance of the sample. (b) How much stray light can be tolerated if the absorbance error is not to exceedat a true absorbance of? (c) A research-quality spectrophotometer has a stray light level of ,at. What will be the maximum absorbance error for a sample with a true absorbance of 2? Of 3?
Describe the role of each component of the spectrophotometer.
The photograph of upconversion in Color Plate 21shows total internal reflection of the blue ray inside the cuvet. The angle of incidence of the blue ray on the wall of the cuvet is. We estimate that the refractive index of the organic solvent is 1.50and the refractive index of the fused-silicacuvet is 1.46. Calculate the critical angle for total internal reflection at the solvent/ silica interface and at the silica/air interface. From your calculation, which interface is responsible for total internal reflection in the photo?
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