+
Related Flashcards
Related Topics
Cards In This Set
| Front | Back |
|
G.1.1Outline the nature of electromagnetic (EM) waves.
|
It is an oscillating electric charge which produces varying electric and magnetic fields, travels as a transverse wave, and has the same speed in a vacuum.
|
|
G.1.3Describe what is meant by the dispersion of EM waves.
|
It is the separation of white light into its component colors due to refraction.
|
|
G.1.4Describe the dispersion of EM waves in terms of the dependence of refractive index on wavelength.
|
EM waves undergo dispersion, dependent on the refractive index, which is influenced by the waves' wavelength.
|
|
G.1.5Distinguish between the transmission, absorption, and scattering of radiation.
|
Transmission - transfer of radiation from one medium to another when energy is supplied to the source which causes the charge to accelerateAbsorption - absorption of radiation by materialScattering - deflection of radiation from its intended path due to collisions with particles in a medium
|
|
G.1.7Explain the terms monochromatic and coherent.
|
Monochromatic - same wavelength and frequencyCoherent - constant phase difference
|
|
G.1.9Outline the mechanism for the production of laser light.
|
Non-coherent radiation is supplied by a power source. Electrons in light-amplifying substance absorb radiation and release photons of energy as monochromatic. coherent laser light.
|
|
G.1.10Outline an application of the use of a laser.
|
-tumor treatment-eye surgery-fiber optics-bar code scanners-weapon guidance systems-cutting materials-CD's and DVD's
|
|
G.2.1Define the terms principal axis, focal point, focal length, and linear magnification as applied to a converging (convex) lens.
|
Principal axis - line that passes through the center of the curvature and the center of the objectFocal point - convergence point of parallel light rays on the principal axis after passing through the lensFocal length - distance between the focal point of the lens and its centerLinear magnification - ratio of height of image to height of object/ratio of distance of image to distance of object
|
|
G.2.2Define the power of a convex lens and the dipotre.
|
Power of a convex lens - reciprocal of focal length of lensDipotre - unit of power for a convex lens (D = m-1)
|
|
G.2.3Define linear magnification.
|
It is the ratio of the height of the image to the height of the object or the ratio of the distance of the image to the distance of the object.
|
|
G.2.4Construct ray diagrams to locate the image formed by a convex lens.
|
The essential rays of a ray diagram (shown in the image) are as follows:-1 ray passes through the optical center without deviation-1 ray parallel to the principal axis passes through the principal axis-1 ray passing through the principal axis
|
|
G.2.5Distinguish between a real image and a virtual image.
|
Real image - can be seen on a screen that has been put at the point where rays intersectVirtual image - appears to come from a different point from original object when rays are extrapolated directly
|
|
G.2.8Define the terms far point and near point for the unaided eye.
|
Far point - position of furthest object that can be brought to focus by an unaided eyeNear point - position of nearest object that can be brought to focus by an unaided eye
|
|
G.2.9Define angular magnification.
|
It is the ratio of the size of the image to the apparent size of the object (angle subtended at the eye by the image to the angle subtended at the unaided eye by the object at near point).
|
|
G.2.10Derive an expression for the angular magnification of a simple magnifying glass for an image formed at the near point and at infinity.
|
M = mM = di/do
1/do + 1/di = 1/f1 + do/di = do/fdo/di = do/f - 1do = dodi/f - di1 = di/f - di/dodi/do = di/f - 1 M = di/f - 1 |
