Question
____ is a blurring of the periphery of an image as a result of inadequate reflection of parallel beams at the edge of a mirror or inadequate refraction of parallel beams at the edge of a lens.
Answer
Spherical aberration is a blurring of the periphery of an image as a result of inadequate reflection of parallel beams at the edge of a mirror or inadequate refraction of parallel beams at the edge of a lens.
Note: If you remember back to conic sections from your precalculus class, it should be no surprise that spherical mirrors and lenses do not focus light perfectly. Parabolas are perfect reflectors, meaning that parallel light rays are reflected perfectly through the focal point. This is used in extracorporeal shock wave lithotripsy, in which a parabolic mirror is positioned with a kidney stone at the focal point. Sound waves are reflected off of the mirror and create enough vibration in the kidney stone to shatter it. See image below.
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Electromagnetic waves are ____ waves that consist of an oscillating electric field and an oscillating magnetic field.
____ waves are transverse waves that consist of an oscillating electric field and an oscillating magnetic field.
Electromagnetic waves are transverse waves that consist of an ____.
The two fields in electromagnetic waves are ____ to each other and to the direction of propagation of the wave
The ____ is the range of frequencies and wavelengths found in EM waves.
The EM spectrum includes, from lowest to highest energy, ____.