Optics 2

question in photo plz

a. Why high energy electron beam (instead of visible light) is used in microscope to increase its resolution? b. In optical fiber communication, why wavelengths ~ 1310 nm and 1550 nm are often preferred? c. What are the conditions for laser oscillation?

CLASS B Q1: Why different semiconductor materials have different wavelength output? Q2: What are the three main necessary characteristics that need to be possessed in order to qualify as a good optical detector?

Discuss the deference between Laser and LED as a transmitter inoptical communication

Applications and consequences of TIR on each: MIRAGE, OPTICAL FIBER, FISH TANK, DIAMOND , AND PRISM

Which statement(s) is(are) true for photomultiplier tubes?I     Photomultiplier tubes are very sensitive detectors, amplifying the photoelectron current by approximately 1 million.II     Emitted photoelectrons are accelerated toward positively charged electrodes called dynodes.III     Electrons strike the dynode with a kinetic energy less than the original emitted kinetic energy.IV     For each electron striking a dynode, more than one electron is knocked free. The additional electrons are accelerated toward the next dynode in the detector where amplification is repeated. Select one: a. II, III, and IV b. II c. I, II, and IV d. II and III e. I and IV

4/. The cathode ray oscilloscope is used to display the applied ____________ in the output terminals. ac or dc signal current capacitance resistance

help me with this homework problem..thanks!

Please answer quickly thank you

None

Choose the answer that you would see as the best correct description of the statement. You should then write a short explanation of why you chose the answer (Hint: because it is the best answer isn’t a sufficient description).

True or Flase Light emitting diode, LEDs, with colors  with different wavelength acts as source of lights but not the laser.

Need Answer For Both Questions ( 1 and 2) Within 15minutes. Otherwise Skip fast.

please solve this question

4 (a) “There are three types of optical fibers available for optic communication”. What are these three types and describe each. You may use diagrams to help you with your answers.  (b) Pin diodes and Avalanche photodiodes (APD) are detectors which are used to convert the transmitted light back into an electrical signal I. Describe the operating principles of a PIN diode and an Avalanche photodiode II. The quantum efficiency of APD is 80% for the detection of radiation at a wavelength of 0.9 μm. When the incident optical power is 0.5 μW, the output current from the device (after avalanche gain) is 11 μA. Determine the multiplication factor of the photodiode under these conditions. (c) A silica optical fibre with a core diameter large enough to be considered by ray theory analysis has a core refractive index of 1.480 and a cladding refractive index of 1.44. Determine: I. The critical angle at the core–cladding interface II. The acceptance angle in air for the fibre.

A quantum cascade laser can be used to generate wave at 3.86 THz. What is the required energy gap required in the active quantum well of the cascade laser? Express your answer in the unit of meV.

All electronics components are formed from p-type and n-type materials. what factors determine the kind of components formed?

Write extensively on Hollow-Cathode Lamp and its uses.

Please answer all subpart in short please Asap for like this Please all subpart in short please..

i need the answer quickly

The vertical deflection of the electron beam in a CRO is provided by,

Using four LEDs: Red, Amber, Green and Blue connected in series to an 18Vsupply, determine the resistance to achieve the desired operating conditions forthe combination of 4 LEDs. Assume that the current is 25mA.

A GAAIAS LED has following specifications: wavelength of 1310 nm Quantum efficiency, Nint = 0.765 The drive current 40 mA. refractive index of the light source material is n=3.5 Calculate: i. Internal power level, Pint- ii. Calculate the power emitted from the device.

The cathode of a device is generally marked, it is indicative of:a. The positive terminal of the device b. The negative terminal of the device c. The type component d. None of the above

If there is a trade-off in between depth-off-focus (DOF) and resolution (R) of a lithography system then, what would be selected,either DOF or R, to obtain better performance in pattern transfer of printing method?

discuss how it is possible to use an LED as an illumination source and detector.

In CRO, the assembly of the cathode, intensity grid, focus grid and is called as Electron gun. O accelerating anode O Deflection Plates O Fluorescent screen O Trigger circuit

Evaluate the gain coefficient for a laser amplifier that is 0.5 m long. The amplifying medium generates double the intensity after one pass. If the intensity increase was only 5%, calculate a new value for the gain coefficient. Explain the importance of the gain coefficient, and its limitations in laser operation.   PLEASE SHOW ALL FORMULAS AND DERIVATIONS STEP BY STEP.

Ims.cisjubail.gov.sa/webapps/assessment/take/launch.jsp?course_assessment_id%3 34730_1&course_id%3_56188 18content id%3 1713242 1 Ta Remaining Time: 46 minutes, 48 seconds. Question Completion Status: -30V- QUESTION 6 Determine whether each silicon diode in the following figure is forward biased (fb) or reversed biased (rb) Using the practical model, the voltage across the diode is V. 10 N 5V 5V Click Save and Submit to save and submit. Click Save All Answers to save all answers.