Exam 3 Flashcards
(47 cards)
The best definition of refraction is
Changing direction when crossing a boundary
A beam of light in air is incident at an angle of 35 degrees to the surface of a rectangular block of clear plastic. The light beam first passes through the block and reemerges from the opposite side into air at what angle to the normal to that surface?
35 degrees
A light ray in air enters and passes through a block of glass. What can be stated with regard to its speed after it emerges from the block?
Speed is the same as that before it entered glass
Which of the following describes what will happen ot a light ray incident on an air-to-glass boundary?
Partial transmission and partial reflection
Which of the following describes what will happen to a light ray incident on an air-to-glass boundary at an angle of incidence less than the critical angle?
Partial reflection and partial transmission
Which of the following describes what will happen to a light ray incident on a glass-to-air boundary at an angle of incidence greater than the critical angle?
Total reflection
A ray of white light, incident upon a glass prism, is dispersed into its various color components. Which one of the following colors experiences the greatest amount of refraction?
Violet
When light from air hits a smooth piece of glass with the ray perpendicular to the glass surface, which of the following will occur?
Reflection and transmission at an angle of 0 degrees
If total internal reflection occurs at a glass-air surface, then
No light is refracted
When light from air hits a smooth piece of glass with the ray perpendicular to the glass surface, the part of the light passing into the glass
Will not change its direction
The person suffering from the problem of myopia
Has difficulty seeing objects placed nearby and will therefore form a smaller image behind the retina
To correct the problem of myopia, you use
a converging lens
If an image was formed in front of the retina rather than behind, the person would suffer from
Hyperopia
To correct for hyperopia, we must use a
Diverging lens
Dispersion occurs when
A material slows down some colors more than others
Which of the following best describes the image for a thin converging lens that forms whenever the object is at a distance less than one focal length from the lens?
Upright, enlarged, and virtual
Which of the following best describes the image for a thin diverging lens that forms whenever the magnitued of the object distance is less than that of the lens’ focal length?
Upright, reduced and virtual
Before light can undergo total internal reflection when incident on material 2 from material 1, what must be true of the indices of refraction?
N1>n2
When light passes from a material with a high index of refraction into material with a low index of refraction
Some light is reflected without a change of phase
The normal eye has a near point of 25 cm. If a given individual’s near point is 73 cm for what problem with the eye doctor prescribe correction?
Hyperopia
A fringe shift occurs for every ___ wavelength movement of the adjustable mirror in a Michelson interferometer
Quarter
According to special theory of relativity, if a 30 year old astronaut sent on a space mission is accelerated to speeds close to that of light and returns to earth after 20 years as measured on earth, what would be his biological age upon returning?
Less than 50 years
As the speed of an object increases, its relativistic momentum
Increases less than its classical momentum
The mass of a proton at rest is m. If the proton is moving so fast that its total energy is 3 times its rest energy, then what is the kinetic energy of the proton.
2mc^2
