# Shared Flashcard Set

## Details

Theory of Optics
State Board Exam
61
Physics
07/29/2008

Term
 Who is known for the corpuscular theory of light?
Definition
 Issac Newton
Term
 Who is known for the wave thoery of light?
Definition
 Huygens
Term
 Who is creditied as the first to attempt to measure the speed of light?
Definition
 Galileo
Term
 Who is the first to calculate the speed of light to the number used today astronomically utilizing the orbits of Earth, Jupiter, and Jupiter's moons?
Definition
 Olaf Romer (186,262 miles/sec)
Term
 The wavelengths of the visible light spectrum are?
Definition
 380 nm. to 780 nm.
Term
 What does light stimulate to produce visual effects?
Definition
 Retinal Cells
Term
 Our eyes are most sensitive to which two colors of the visible light spectrum?
Definition
 Green and Yellow
Term
 The two colors which are most sensitive to the human eye have wavelengths of?
Definition
 500 nm. to 590 nm.
Term
 A medium surrounded by air permits light to travel at a speed of 122,127.38 mps. What is the medium?
Definition
 186,262    = 1.523122,127.38 Index of Refraction is Crown Glass
Term
 Light is said to behave as a ?
Definition
 Transverse Wave
Term
 When two waves meet and cancel each other is known as?
Definition
 Destructive Interference
Term
 Destructive interference is the principle phenomenum utilized for?
Definition
 Anti-Reflective Coating
Term
 What type of light source is infinetely small?
Definition
 Point Source
Term
 A source that has a measurable area is?
Definition
 Extended Source
Term
 UV light has wavelengths below 380 nm. Wavelengths below what number are considered harmful to the human eye?
Definition
 400 nm.
Term
 What four things can happen when light strikes an object?
Definition
 TransmissionPressureAbsorptionReflection
Term
 A wavelength is measured by the distance between what two points of the same phase?
Definition
 Crest to CrestorTrough to Trough
Term
 In the study of optics, which are the four general rules of light?
Definition
 Light travels from left to rightLigh is always divergentWhen light reaches 20ft. it is considered parallelWe round the index of air to 1.00 N.
Term
 When light travels from a dense to less dense medium it is refracted?
Definition
 Away from the normal
Term
 Long UV has a shorter wavelength than?
Definition
 Infared and Visible Light
Term
 Light which is made up of multiple wavelengths is?
Definition
 Polychromatic
Term
 As Opticians we are concerned about protecting our eyes from wavelengths?
Definition
 Below 400 nm.
Term
 The period of a wave is .05 seconds. What is the frequency?
Definition
 Frequency =           1                        Period 20 cycles per second = Frequency
Term
 What are the wavelengths of MID UV B and its affects to the human eye?
Definition
 280 nm. to 320 nm. Light rays will partially transmit through the crystalline lens and reach the retina.
Term
 A wave has a velocity of 300 ft/sec and a wavelength of 15ft. What is the frequency?
Definition
 Velocity = Frequency * Wavelength  300 = F * 15 Frequency = 20 vibrations per sec.
Term
 The frequency of a wave is 10 vibrations per second. What is the period?
Definition
 Frequency =          1                        Period Period = 0.1 Seconds
Term
 A wave has a frequency of 15 cycles per second, and a wavelength of 10 ft. What is the velocity?
Definition
 Velocity = Frequency * Wavelength Velocity = 15 * 10 Velocity = 150 ft/sec
Term
 A wave has a velocity of 500 ft/sec and a frequency of 25 cycles per sec. What is the wavelength?
Definition
 Velocity = Frequency * Wavelength 500 ft/sec = 25 * Wavelength Wavelength = 20 Ft.
Term
 What are the wavelengths of LONG UV A and its affects to the human eye?
Definition
 320 nm. to 380 nm. Light rays will transmit through the anterior structures of the eye and reach the retina
Term
 What are the wavelengths of SHORT UV C  and its affects to the human eye?
Definition
 100 nm. to 280 nm.  Light rays are absorbed by the conjuctiva and cornea.
Term
 What are the wavelengths of VACUUM UV  and what happens to its light rays?
Definition
 10 nm. to 100 nm.  Light rays are absorbed by the atmosphere
Term
Definition
 Penumbra
Term
Definition
 Umbra
Term
 What three types of images are found in plane mirrros?
Definition
 Virtual ErectLeft for right reversed
Term
 Define a spherical mirror
Definition
 Polished Opaque objects with a reflection.
Term
 Define a virtual image in spherical mirrors
Definition
 Where light rays appear to meet
Term
 Define a real image in spherical mirrors.
Definition
 Where light rays actually meet
Term
 Define center of curvature in spherical mirrors.
Definition
 The center of the sphere from which the mirror is constructed.
Term
 For spherical mirrors and lenses all?
Definition
 Real images are inverted and all virtual images are erect.
Term
 Define a concave mirror
Definition
 A spherical mirror in which the inside portion is covered with a reflecting materical. CONVERGING.
Term
 Define a convex mirror.
Definition
 A spherical mirror in which the outside is covered with a reflecting material. DIVERGING.
Term
 Define radius of curvature in a spherical mirror.
Definition
 Distance from center of curvature to the mirror and is equal to twice the focal length.
Term
 Define a convex lens.
Definition
 A postive dioptric value lens which causes parallel incident rays of light to converge.
Term
 Define a concave lens.
Definition
 A negative dioptric value lens which causes parallel incident rays of light to diverge.
Term
 Define magnification in lenses and mirros.
Definition
 The ratio of image size to object size also equal to the ratio of image distance to object distance with sign reversed.
Term
 With spherical mirrors and lenses...
Definition
 Object distance and object size are always plus.
Term
 With converging spherical mirrors and lenses...
Definition
 The focal length is always plus
Term
 For spherical mirros and spherical lenses; if MAGNIFICATION is greater than 1 then...
Definition
 The image is larger that the object.
Term
 For spherical lenses and mirros; if MAGNIFICATION is plus then...
Definition
 The image is erect
Term
 For spherical mirrors and lenses; if IMAGE distance is plus then...
Definition
 The image is real
Term
 An object that does not transmit light is said to be?
Definition
 Opaque
Term
 According to Z80.3 ANSI the wavelengths bordering the visible spectrum are...
Definition
 380nm. to 780 nm.
Term
 Fiber optics is a good example of this optical principle.
Definition
 Total internal reflection
Term
 A transverse wave vibrates              to the direction of propogation.
Definition
 Perpendicular
Term
 In optics, an object is considered to be at "optical infinity" if the object distance exceeds...
Definition
 20 ft.
Term
 When dealing with concave spherical mirrors; if the object is located between the focal point and the mirrored surface, the image will always be ...
Definition
 Vitrual Erect Enlarged
Term
 Who is the first to postulate that light is composed of electromagnetic energy?
Definition
 James C. Maxwell
Term
 A small portion of the spectrum such as one wavelength or a small band of wavelengths is...
Definition
 Monochromatic
Term
 What is the diagram which shows how light behave?
Definition
 Wavefront
Term
 what is the two most occuped theories?
Definition
 Newton : Corpuscular theory of lightHuygens: Wave theory of light
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