physics 2 test 1

What is the minimum value that the index of refraction can have?

+1

Which one of the following numbers is the correct magnification produced by a plane mirror?

1

Index of Refraction: 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.

Spherical Mirrors: Which of the following statements about spherical mirrors is correct? A concave mirror always produces a real image. A convex mirror always produces an upright image. A concave mirror always produces a virtual image. A convex mirror always produces a real image. A convex mirror always produces a virtual image.

A convex mirror always produces an upright image.

Suppose you place an object in front of a concave mirror. Which of the following statements must be true?

If you position the object between the mirror and the focal point of the mirror, its image must be upright and virtual.

A virtual image of an object can be formed by: a plane mirror a diverging lens a converging mirror a converging lens any of the above

any of the above

According to the thin-lens equation, when an object is infinitely far away from a lens, where will the image form?

at the focal point of the lens

The image seen in a plane mirror is located __________.

behind the mirror

Farsightedness can usually be corrected with

converging

focal length tells us

converging lens /concave mirror (+) or diverging lens/convex mirror (-)

Nearsightedness is usually corrected with

diverging lens

Snell's Law: Light enters air from water. The angle of refraction will be

greater than the angle of incidence.

Which of following statements about the image formed by a single diverging lens are true? The image is always real. The image is always smaller than the object. The image is always upright. The image is always inverted. The image is always virtual.

image always virtual

Starting from very far away, an object is moved closer and closer to a diverging lens, eventually reaching the lens. What happens to its image formed by that lens? (There could be more than one correct choice.)

image gets larger and larger

What does a negative magnification indicate?

image is inverted

When light propagates from a material with a given index of refraction into a material with a smaller index of refraction, the speed of the light

increases

In the case of n1>n2, if the incidence angle is increased, the angle of refraction

increases up to a max angle of 90 degrees

If the magnification of a mirror or lens is negative, it means that

inverted

Snell's Law: Light enters glass (n=1.52) from air. The angle of refraction will be

less than the angle of incidence.

to have a lower magnification on a telescope, you need a ___________ focal length for the eye piece

longer

Snell's Law: 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

What conditions are necessary for total internal reflection to occur? Choose all that apply.

n2 must be less than n1 θ1 must be greater than θc

Which of following statements about the image formed by a single converging lens are true? (There could be more than one correct choice.) The image is always inverted. The image is always virtual. The image is always real. The image is always upright. None of the above choices are correct.

none

Part complete Thin Lenses: 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

Thin Lenses: 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

to have a higher magnification on a telescope, you need a _________ focal length for the eyepiece

shorter

The focal length of a converging lens is __________.

the distance at which parallel light rays are focused.

Consider a ray of light that propagates from air (n=1) to any one of the materials listed below. Assuming that the ray strikes the interface with any of the listed materials always at the same angle θ1, in which material will the direction of propagation of the ray change the most due to refraction?

the one with the greatest index of refraction

The shape of a converging lens is ______________.

thicker in the center than the edges

The shape of a diverging lens is ______________.

thicker in the center than the edges

A convex mirror has a focal length of magnitude f. An object is placed in front of this mirror at a point 23f from the face of the mirror. The image will appear

upright and reduced.

magnification tells us

upright vs. inverted

In the way that a magnifier is usually used, the object is placed __________.

very close to the focal point of the lens

we see _____ images

virtual

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

distance tells us

virtual vs real

What can you say about orientation of your image in a diverging mirror?

your image is upright

Which statement about a single thin lens is correct? A converging lens always produces a real inverted image. A converging lens sometimes produces a real upright image. A diverging lens always produces a virtual inverted image. A diverging lens always produces a virtual upright image. A diverging lens produces a virtual upright image only if the object is located between the lens and its focal point.

A diverging lens always produces a virtual upright image.

Spherical Mirrors: Which statements about images are correct? A virtual image cannot be photographed. A virtual image cannot be viewed by the unaided eye. Mirrors always produce real images because they reflect light. A virtual image cannot be formed on a screen. A real image must be erect.

A virtual image cannot be formed on a screen.

When glasses (or contact lenses) are used to correct nearsightedness, where should the corrective lens form an image of an object located at infinity in order for the eye to form a clear image of that object?

The lens should form the image at the far point.

When glasses (or contact lenses) are used to correct farsightedness, where should the corrective lens form an image of an object located between the eye and the near point in order for the eye to form a clear image of that object?

The lens should form the image at the near point.