1. Visible light covers the range of wavelengths 380 to 740 nm. Optical communications widely use 1300 nm and 1550 nm. What values of frequency do all these wavelengths correspond to? (c = 3.0 x 10 ms-)
1. Visible light covers the range of wavelengths 380 to 740 nm. Optical communications widely use 1300 nm and 1550 nm. What values of frequency do all these wavelengths correspond to? (c = 3.0 x 10 ms-)
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Transcribed Image Text:Optical Engineering 2: Tutorial 1
1. Visible light covers the range of wavelengths 380 to 740nm. Optical communications
widely use 1300 nm and 1550 nm. What values of frequency do all these wavelengths
correspond to? (c = 3.0 x 10* ms-)
2. An given optical fibre has an optical loss of 0.2 dB km- at a wavelength 1.55 m. Over
what distance in the fibre would the light power level drop by one half?
3. You are at the bottom of a swimming pool, looking up. What do you see? The refractive
index of water is 1.33, therefore what is the angular size of any feature?
4. A light ray enters a rectangular block of glass (n = 1.5) of width 20 mm at an angle of 30°
to the normal. What is the displacement of the ray after propagating through the block?
5. Calculate the focal length in air of a thin biconvex lens (n=1.5) having radii 20 mm and
40 mm. What is the focal length if the lens is placed in water?
6. An object of size 20 mm is positioned near to the optic axis 75 mm from a positive lens of
focal length 100 mm. Describe the resulting image completely.
7. A mirascope 3D toy consists of two parabolic mirrors to create a "mirage" of an object.
Explain how such a device works. What should be the ideal ratio of the diameter to the
height of this device?
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