physics rays
An object is placed 50 cm in front of a concave mirror with a focal length of 25 cm. What is the magnification produced by the mirror?
-1
An object is placed 21 cm from a concave lens having a focal length of magnitude 25 cm. What is the magnification?
.54
Which one of the following numbers is the correct magnification produced by a plane mirror?
1
A glass plate having an index of refraction is 1.66 is immersed in a certain alcohol. The surface of the glass is inclined at an angle of 44° with the vertical. When a horizontal ray in the glass strikes the interface, you observe that it is at the critical angle. What is the index of refraction of the alcohol?
1.15
A thin beam of light enters a thick plastic sheet from air at an angle of 32.0° with the normal and continues in the sheet at an angle of 23.0° with the normal. What is the index of refraction of the plastic?
1.36
A glass plate with an index of refraction is 1.57 is immersed in an oil having a refractive index of 1.40. The surface of the glass is inclined at an angle of 54° with the vertical. A horizontal light ray in the glass strikes the interface. What is the angle that the refracted ray, in the oil, makes with the horizontal?
11
If the index of refraction of a material is 2, this means that light travels
2 times as fast in vacuum as it does in the material.
A beam of light traveling in air strikes a slab of transparent material. The incident beam makes an angle of 40° with the normal, and the refracted beam make an angle of 26° with the normal. What is the speed of light in the transparent material? (c = 3.0 × 108 m/s)
2.0 × 108 m/s
When an object is 12 cm in front of a concave mirror, the image is 3.0 cm in front of the mirror? What is the focal length of the mirror?
2.4 cm
An oil layer that is 5.0 cm thick is spread smoothly and evenly over the surface of water on a windless day. A light ray from the air above enters the oil at 45° with the normal and then goes into the water. What is the angle of refraction of this ray in the water? The index of refraction for the oil is 1.15, and for water it is 1.33
32
A cell phone is placed 40 cm in front of a converging lens with a focal length of magnitude 20 cm. How far is the image of this phone from the lens?
40cm
The focal length of a concave mirror has a magnitude of 20 cm. What is its radius of curvature?
40cm
A seed is 15 mm in front of a converging lens, and the image of the seed is 4.0 mm behind the lens. What is the focal length of the lens?
5.5 mm
Which statement about a single thin lens is correct?
A diverging lens always produces a virtual upright image.
Which statements about images are correct? (There could be more than one correct choice.) Select one: a. A virtual image cannot be formed on a screen. CorrectCorrect b. A real image must be erect. c. Mirrors always produce real images because they reflect light. d. A virtual image cannot be viewed by the unaided eye. e. A virtual image cannot be photographed.
A virtual image cannot be formed on a screen.
Suppose you place an object in front of a concave mirror
If you position the object between the mirror and the focal point of the mirror, its image must be upright and virtual
A beam of light that is parallel to the principal axis strikes a convex mirror. What happens to the reflected beam of light?
It appears to be coming from the focal point on the other side of the mirror.
A beam of light that is parallel to the principal axis strikes a concave mirror. What happens to the reflected beam of light?
It passes through the focal point of the mirror.
Suppose you wanted to start a fire using a mirror to focus sunlight. Which of the following statements is most accurate?
It would be best to use a concave mirror, with the object to be ignited positioned halfway between the mirror and its center of curvature.
Single convex spherical mirrors produce images that
Single convex spherical mirrors produce images that
Starting from very far away, an object is moved closer and closer to a converging lens, eventually reaching the lens. What happens to its image formed by that lens?
The image eventually changes from real to virtual.
A 4.0-cm tall object is placed 60 cm in front of a converging lens of focal length of magnitude 30 cm. What are the nature and location of the image?
The image is real, 4.0 cm tall, 60 cm on the other side of the lens.
Is it possible to see a virtual image?
Yes because the rays that appear to come from a virtual image can be focused by the eye just like those from an object.
Sometimes when you look into a curved mirror you see a magnified image (a great big you) and sometimes you see a diminished image (a little you). If you look at the bottom (convex) side of a shiny spoon, what will you see?
You will see a little you, right side up.
The image formed by a single concave lens
always virtual
If an object is placed at the center of curvature of concave mirror, the image formed by the mirror is located
at the center of curvature.
The image formed in a plane mirror is
at the same distance behind the mirror as the object is in front of the mirror.
A convex lens has focal length f. If an object is placed at a distance beyond 2f from the lens on the principal axis, the image is located at a distance from the lens
between f and 2f
Single concave spherical mirrors produce images that
could be smaller than, larger than, or the same size as the actual object, depending on the placement of the object.
Light enters air from water. The angle of refraction will be
greater than the angle of incidence.
The index of refraction of a type of glass is 1.50, and the index of refraction of water is 1.33. If light enters water from this glass, the angle of refraction will be
greater than the angle of incidence.
As you walk away from a plane mirror on a wall, the height of your image
is always the same size
Light enters glass from air. The angle of refraction will be
less than the angle of incidence.
Light goes from material having a refractive index of n1 into a material with refractive index n2. If the refracted light is bent away from the normal, what can you conclude about the indices of refraction?
n1 > n2
A light beam has speed c in vacuum and speed v in a certain plastic. The index of refraction n of this plastic is
n=c/v
Which of following statements about the image formed by a single converging lens are true? (There could be more than one correct choice.) Select one: a. The image is always real. b. The image is always upright. c. The image is always virtual. d. The image is always inverted.
none
A convex lens has focal length f. If an object is placed at a distance of 2f from the lens on the principal axis, the image is located at a distance from the lens
of 2f
A convex lens has focal length f. If an object is located at "infinity" (very far away), the image formed is located at a distance from the lens
of f
An upright object is 50 cm from a concave mirror of radius 60 cm. The character of the image is
real and inverted
A convex lens has focal length f. If an object is placed at a distance between f and 2f from the lens on the principal axis, the image is located at a distance from the lens
that is greater than 2f
If the magnification of a mirror or lens is negative, it means that
the image is inverted
A negative magnification for a mirror means that
the image is inverted, and the mirror is concave.
If a single lens forms a virtual image of an object, then
the lens could be either a diverging or a converging lens.
The critical angle for a beam of light passing from water into air is 48.8°. This means that all light rays with an angle of incidence in the water that is greater than 48.8° will be
totally reflected
An object is placed in front of a convex mirror at a distance larger than twice the magnitude of the focal length of the mirror. The image will appear
upright and reduced
A convex mirror has a focal length of magnitude f. An object is placed in front of this mirror at a point f from the face of the mirror. The image will appear
upright and reduced.
If a object is placed between a convex lens and its focal point, the image formed is
virtual and upright
Which one of the following sets of characteristics describes the image formed by a plane mirror?
virtual and upright
If you stand in front of a convex mirror, at the same distance from it as its radius of curvature,
you will see your image and you will appear smaller than you
If you stand in front of a convex mirror, at the same distance from it as its focal length,
you will see your image and you will appear smaller than you.
