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2. College Level Examination Program - Wikipedia

   en.wikipedia.org/wiki/College_Level_Examination...

   Exams are administered on a computer in a lab style setting. Final results are available immediately after completing the exam. CLEP tests are primarily multiple-choice exams (though some include fill-in or ordering questions, and one College Composition exam has an essay section) which are scored on a scale from 20 to 80.

3. Principles and Practice of Engineering exam - Wikipedia

   en.wikipedia.org/wiki/Principles_and_Practice_of...

   Exams are offered twice a year, once in April and once in October, and are discipline-specific. [3] With the exception of the Structural exam, each exam is eight hours long, consisting of two 4-hour sessions administered in a single day with a lunch break. There are 40 multiple-choice questions per session.

4. Snell's law - Wikipedia

   en.wikipedia.org/wiki/Snell's_law

   Fermat supported the opposing assumptions, i.e., the speed of light is finite, and his derivation depended upon the speed of light being slower in a denser medium. [12] [13] Fermat's derivation also utilized his invention of adequality, a mathematical procedure equivalent to differential calculus, for finding maxima, minima, and tangents. [14] [15]

5. Optics - Wikipedia

   en.wikipedia.org/wiki/Optics

   A major subfield of modern optics, quantum optics, deals with specifically quantum mechanical properties of light. Quantum optics is not just theoretical; some modern devices, such as lasers, have principles of operation that depend on quantum mechanics. Light detectors, such as photomultipliers and channeltrons, respond

6. Acoustics - Wikipedia

   en.wikipedia.org/wiki/Acoustics

   Acoustics is a branch of physics that deals with the study of mechanical waves in gases, liquids, and solids including topics such as vibration, sound, ultrasound and infrasound. A scientist who works in the field of acoustics is an acoustician while someone working in the field of acoustics technology may be called an acoustical engineer .

7. Acousto-optics - Wikipedia

   en.wikipedia.org/wiki/Acousto-optics

   Sound waves produce a refractive index grating in the material, and it is this grating that is "seen" by the light wave. [1] These variations in the refractive index, due to the pressure fluctuations, may be detected optically by refraction, diffraction, and interference effects; [ 2 ] reflection may also be used.

8. Fermat's principle - Wikipedia

   en.wikipedia.org/wiki/Fermat's_principle

   According to the "strong" form of Fermat's principle, the problem of finding the path of a light ray from point A in a medium of faster propagation, to point B in a medium of slower propagation , is analogous to the problem faced by a lifeguard in deciding where to enter the water in order to reach a drowning swimmer as soon as possible, given ...

9. Inverse-square law - Wikipedia

   en.wikipedia.org/wiki/Inverse-square_law

   S represents the light source, while r represents the measured points. The lines represent the flux emanating from the sources and fluxes. The total number of flux lines depends on the strength of the light source and is constant with increasing distance, where a greater density of flux lines (lines per unit area) means a stronger energy field.