Physics Ray Optics Level: High School
Ray Optics
A light ray passes downward into a block of transparent plastic with an angle of incidence of theta = 52.8 degrees . If total internal reflection is to occur when the light strikes the left edge of the block at interface b , what is the index of refraction of the plastic ?
Physics Ray Optics Level: High School
Wave Optics
If the apparatus for a Young’s double slit experiment is completely immersed in water will the spacing of he interference fringes (i) increases , (ii)remain the same (iii) decrease . Why ? , What would the lateral displacement in exercise in the above question if the entire system were immersed in still water ?
Physics Ray Optics Level: High School
Wave Optics
Monochromatic light passes through two narrow slits and forms an interference pattern on a screen .(a) If the wavelength of light used increases will the distance between the bright fringes(i) increase (ii) decrease (iii) remain the same , why ?
(b) If the slit separation is 0.25 mm , the screen is 1.5m away from the slits , and light of wavelength 680nm is used , what is the distance from the center of the central maximum to the center of the third order bright fringe ?
Physics Ray Optics Level: High School
Two thin lenses are placed 4.00 cm apart . The first lens is ca concave meniscus with radii of one third and one half centimeters , the second lens is a symmetric double convex lens with radii of one quarter centimeter . An object 2.00 cm high is placed 6.00 cm in front of the first lens . Determine the image location , image height and orientation by .(a) direct measurement on an accurate ray tracing .
(b) geometric analysis of the ray diagram (that is looking at triangles)
(c) use of the thin lens equations
Physics Ray Optics Level: High School
Light with a wavelength of 600 nm (in vaccum) reflects horizontally from a vertical soap film . The force of gravity causes the soap film to acquire the shape of a very thin wedge (exaggerated in the figure at “click here”) when viewed from the side . The upper edge of the film appears black . Alternating horizontal bright and dark bands cover the film in such a way that the lowest edge of the film is the sixth bright band. The film is 2.75 cm long . The index of refraction of the soap film is 4/3 .a) Explain why light reflected from the front and back surface of the film create these bright and dark bands . In your answer explain why the uppermost edge is dark .
b) Determine the angle of the wedge .
Physics Ray Optics Level: High School
A glass hemisphere of index 1.5 and radius R has a mirror surface on its flat face . A small object of height h is located on the axis of the hemisphere at a distance of 2R from the vertex as shown in the figure at “click here”(a) Determine the location of the final image .
(b) Determine the orientation and magnification of the final image
(c) Draw a ray diagram showing the formation of the final image . In this construction use a ray directed to the centre of he hemisphere and another which is incident at the vertex of the hemisphere .
Physics Ray Optics Level: High School
Semiconductor
An ideal dfb laser diode has a threshold current of 12 mA and a slope efficiency of 0.3 mW/mA at room temperature . Sketch the light (optical output power) versus drive current for this device at room temperature . How much optical power is emitted at a drive current of 32 mA ?
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 Heat & Thermodynamics Level: High School
Which two temperature changes are equivalent ?a. 1 degree F = 1 degree C
b. 1 degree C = 1 K
c. 1K = 1 degree F
Physics Properties Of Matter Level: High School
Aluminum has a positive coefficient of thermal expansion . Consider a round hole that has been drilled in a large sheet of Aluminum . As the temperature increases and the surrounding metal expands , the hole diameter will : Decrease , increase , depends how much metal surrounds the hole or remain constant ?