PHYSICS 2020- TEST 3
What is the Brewster angle (theta sub b) for complete polarization for light impinging on a water surface (n= 1.33) from air (n= 1.00)?
53.1 degrees
Light reflecting off of a rough piece of paper is an example of?
Diffuse Reflection
Incident light moves through liquid water ( n=1.33) and passes through an interface between water and glass (n= 1.52) at some angle other than the normal to the interface. Which of the following is true of the refracted beam?
It bends towards the normal to the interface.
Red and blue light are simultaneously passed through a diffraction grating. The first-order maxima for the red light is located 20 cm from middle of the central bright fringe. Where is the first-order maxima for the blue light located?
Less than 20 cm from the middle of the central bright fringe
The radial lines pointing outward away from the wave source and perpendicular to the wave fronts are called?
Rays
X-rays diffract from crystalline matter because...
The wavelength of the X-rays is comparable to the atomic spacing in matter.
True or False: An interferometer is a device that utilizes interference effects to measure the wavelength of light.
True
True or False: Compact discs (CDs) and digital video discs (DVDs) rely on interference effects of light for their operation.
True
True or False: X-ray diffraction from crystalline matter can provide information on the spacing of atoms and the nature of the crystal structure.
True
Suppose you are standing in front of a concave spherical mirror. Which of the following image properties are possible? our image is upright. Your image is inverted. Your image is enlarged. Your image is reduced. Your image is real. Your image is virtual. All of the above.
all of the above
which of the following is true: Electromagnetic waves are created by accelerating charges. Electromagnetic waves are transverse waves. Electromagnetic waves consist of time-varying electric and magnetic fields that are mutually perpendicular. Electromagnetic waves move at the speed of light in a vacuum.
all of the above
What is the greatest distance an image can be located behind a convex spherical mirror?
di= -f
For specular reflection from a smooth surface, the angle of incidence measured relative to the normal to the surface
will be equal to the angle of reflection as measured relative to the normal to the surface.
A section of the surface of a hollow sphere has a radius of curvature of 0.60 m, and both the inside and outside surfaces have a mirror-like finish. What are the focal lengths of the inside and outside surfaces?
+0.3 m and -0.3 m *because Concave is +R/2 and convex is -R/2
If the speed of light in some unknown material is 2.00 × 108 m/s, what is the index of refraction of the medium?
1.50
Light from a laser pointer is goes through a window composed of crown glass, which has an index of refraction of n=1.523. What is the speed of the light while it is in the window glass?
1.97e8 m/s
A thin film with a refractive index of 1.20 is surrounded by air on both sides. What is the minimum nonzero thickness for this film when it appears red in light with a wavelength in vacuum of 650 nm?
135nm
A diffraction grating has 45,000 slits/cm. What is the distance between adjacent slits?
2.2 × 10^-5 cm
Where is the image located in the case of an object placed at a distance d0=2f to the left of a converging lens?
2f
An incident beam of light moves through liquid water (n= 1.33) and impinges upon an interface with glass (n=1.52) with an angle of incidence of 47.0o.What is the angle of the refracted beam (i.e., in the glass) with respect to the surface normal?
39.8 degrees
An incident beam of light travels through glass (n= 1.52) and impinges upon an interface with liquid water (n= 1.33). What is the critical angle (theta sub c) for total internal reflection at the interface (i.e., with respect to the surface normal)?
61.0 degrees
In light sources that utilize electrical gas discharge, like in neon signs, the emitted light is composed of discrete colors rather than the full spectrum (such as in sunlight). Even though the gas discharge source emits multiple colors of light, your eyes can only detect one color. If the light from a gas discharge source is passed through a prism, what will you see?
A series of individual colors located where they would otherwise be in the full spectrum (but the other colors in the spectrum are missing).
Based on how the size of your pupils responds to light levels, when would human eyes have their best optical resolution?
At night
Two pieces of the same glass are covered with thin films of different materials. In reflected sunlight, however, the films have different colors. Why?
Both of the preceding answers could be correct.
True or False: It is possible to use a convex spherical mirror to produce an enlarged image.
False
Consider a converging lens with a focal point . Without changing the shape and size of the lens, what could you do to move the focus closer to the lens?
Make the lens from a material with a larger index of refraction.
A sound wave has a much greater wavelength than a light wave. If both waves pass through an open doorway, which one, if either, will diffract to a greater extent.
Sound Wave
If a glass prism ( n=1.52) were surrounded by water ( n=1.33) rather than air (n= 1.00) how would the dispersion of the light change?
The colors would be less spread out (i.e., less dispersed).
What is true of the image formed by a diverging lens when the object is placed far away?
The image is much smaller than the object, virtual, and located near the focus on the same side of the lens as the object.
Which of the following is not a property of an image formed by a plane mirror? The image is located as far behind the mirror as the object is in front. The image is real. The image is reversed from left to right. The image is upright with respect to the object. The image is virtual.
The image is real
Suppose a converging lens focuses parallel light at a point to its right. If you place a second, identical lens so that its focal point (on its left) is located at point , what happens on the right of the second lens?
The light is parallel to the principal axis on the right of the second lens.
A diffraction pattern is created on a screen when blue light is passed through a single slit. Does the central bright maximum in this pattern become wider or narrower, when the blue light is replaced by red light?
Wider
You are using a small telescope to view two closely spaced light bulbs located a mile away. Each light bulb is emitting blue light. At this distance, the light bulbs are still too close together for you to distinguish them as separate bulbs. If they were emitting red light instead, would you have a better or worse chance of distinguishing them as separate bulbs?
Worse
How does the Brewster angle (theta sub b) for complete polarization of reflected light change when the ratio between the indices of refraction n2/n1 of the two media increases?
it gets larger (relative to normal)
How does the critical angle (Theta sub c) for total internal reflection change when ratio between indices of refraction n2/n1 of the two media decreases?
it gets smaller(relative to normal)
Calculate the magnification of the image when an object is placed at a distance d0=2f to the left of a converging lens. Is the image inverted or upright?
m=-1, inverted
Is it possible for a converging lens to focus the image of an object on a screen if the object located between the focal point and the lens?
No, because the image is virtual and forms on the same side of the lens as the object.
Assume in Figure 27.14 that the distances and are equal, so that the observer sees bright light in the viewing telescope. The compensating plate is now removed. The observer now sees no light inside the viewing scope. Which of the following could be true?
The thickness of the compensating plate is equal to Lamda/4
Which of the following is true at a very far distance from a wave source?
The wave fronts reaching you form flat planes, and the rays are parallel to each other.
