Physics Ray Optics Level: High School
Semiconductor
A step index fiber has a core index of n1 = 1.556 and a cladding index of n2 = 1.549 , a V number of 30 , and an equilibrium length of 3 km . approximately how many modes does this fiber support ? What is the pulse spread due to multi-mode distortion for a 20km length of this fiber ?
Physics Ray Optics Level: High School
Semiconductor
An InGaAsP PIN detector has a dark current of 3 nA and a responsivity of 0.5 A/W at a wavelength of 1550 nm . Estimate the minimum detectable power for this device . If 50 microW of 1310 nm radiation are incident on this detector , What current flows through the load resistor in a sample PIN circuit that is properly designed ?
Physics Ray Optics Level: High School
Semiconductor
An InGaAsP distributed feedback semiconductor laser emits optical radiation with a free space wavelength of 1550 nm , has a bandwidth of 0.15 nm, and an effective index of 3.24 . What is the frequency . Phase velocity , grating period and wavelength of the optical radiation inside the semiconductor laser ?
Physics Ray Optics Level: High School
Semiconductor
Sketch a simple circuits showing how a semiconductor laser and a semiconductor detector are biased for normal operation .
Physics Ray Optics Level: High School
Semiconductor
Calculate the index of refraction for a good antireflection coating for Si detector (n=3.4) placed in air that will minimize the reflection from the detector surface .
Physics Ray Optics Level: High School
Corning makes an dispersion compensating fiber . Explain how it would be used in long haul optical fiber system .
Physics Ray Optics Level: High School
Consider an oil film (n = 1.50 ) on water (n = 1.33 ) and light of wavelength 600 nm in air, incident on the film . The minimum film thickness for constructive interference of the light in air is :
Physics Ray Optics Level: High School
Thin films
What is the minimum (non-zero) thickness for the air layer between two flat glass surface if the glass is to appear dark when 6.8E2-nm light is incident normally ?What if the glass is to appear bright ?
Physics Ray Optics Level: High School
Diffraction
How many lines per centimeter does a grating have if the third-order occurs at an 16.9o angle for 5.7E2-nm light ?
Physics Ray Optics Level: High School
Interference
In a double slit experiment , it is found that blue light of wavelength 3.6E2 nm gives a second-order maximum at a certain location on the screen . What wavelength of visible light would have a minimum at the same location ?
Physics Ray Optics Level: High School
How far apart are an object and an image formed by a 75-cm-focal-length converging lens if the images is 2.0 x larger than the object and is real ?
Physics Ray Optics Level: High School
How far from a converging lens with a focal length of 21 cm should an object be placed to produce a real image which is the same size as the object ?
Physics Ray Optics Level: High School
A stamp collector uses a converging lens with focal length 26cm to view a stamp 16cm in front of the lens .(a) Is the image real or virtual ?
(b) What is the magnification ?
Physics Ray Optics Level: High School
Total internal reflection
A beam of light is emitted in a pool of water from a depth of 77.0 cm . Where must it strike the air-water interface , relative to the spot directly above it . In order that the light does not exit the water ?
Physics Ray Optics Level: High School
A light beam composed of red and blue light is incident upon a rectangular glass plate , as shown in the figure at “click here” . The light emerges into the air from point P as two separate beams .That are parallel , with the blue beam displaced below the red beam .
That are parallel , with the red beam displaced below the blue beam .
That are not parallel , with the red beam displaced below the blue beam .
That are not parallel , with the blue beam displaced below the red beam .
None of the listed is correct .
