physics test 2

How far from a concave mirror (radius 27.4 cmcm ) must an object be placed if its image is to be at infinity?

13.7, half the radius

Suppose that you want to take a photograph of yourself as you look at your image in a mirror 3.0 mm away.

6 m, double the image distance

for a convex mirror

A mirror with a surface that curves outward ALWAYS virtual, upright, smaller

Describe how an image changes (relative to the object ) when the object moves from just outside the focal point of a converging lens to just inside it.

As the object moves from just outside the focal point of a converging lens to just inside it, the image goes from large and inverted to large and upright.

You want to create a spotlight that will shine a bright beam of light with all of the light rays parallel to each other. You have a large concave spherical mirror and a small lightbulb. Where should you place the lightbulb?

At the focal point of the mirror.

Suppose we replace the lens in the video with one that has a longer focal length. To keep the image sharp, how should we move the screen?

Away from the lens

When moonlight strikes the surface of a calm lake, what happens to this light?

Some of it reflects back to the air; some enters the water.

You cover half of a lens that is forming an image on a screen. Compare what happens when you cover the top half of the lens versus the bottom half.

The image becomes half as bright in both cases.

Select the correct statement about the magnitude of the magnification of a concave mirror if the object is within Center of Curvature (dodo < rr).

The magnitude of the magnification of a concave mirror is greater than 1.

Select the correct statement about the magnitude of the magnification of a concave mirror if the object is beyond the center of curvature (dodo > rr).

The magnitude of the magnification of a concave mirror is less than 1

If you shine a light through an optical fiber, why does it come out the end but not out the sides?

Total internal reflection makes the light reflect from the sides.

Which of the following can form an image? A lens curved on both sides. A curved mirror. A lens curved on only one side. A plane mirror. All of the above.

all of the above

When walking toward a concave mirror you notice that the image flips at a distance of 0.35 mm .

double the image distance. 0.7 m

in a CONCAVE mirror, if an object is between the center and the focal point, f<do<2f, the image will be?

inverted, larger, real

in a CONCAVE mirror, if an object is outside the center of curvature, do>2f, the image will be?

inverted, smaller, and real

A lens can be characterized by its power, which

is the reciprocal of the focal length.

virtual image

light does not pass through

real image:

light passes through it

A converging lens, such as a typical magnifying glass, always produces an image smaller than the object. always produces a magnified image (taller than object). always produces an inverted image (upside down). always produces an upright image. None of these statements are true.

none of these

Virtual images can be formed by

plane and curved mirrors, and lenses.

the focal length for converging and diverging lens is

positive for converging, negative for diverging

in thin lenses, the image distance is

positive if the image is on the opposite side of the lens with respect to the side the light comes from, otherwise, it is negative

in thin lenses, image height is

positive if the image is upright, and negative if the image is inverted

in thin lenses, the object distance is

positive if the object is on the side of the lens the light is coming from , otherwise it is negative

Where should an object be placed in front of a concave mirror so that it produces an image at the same location as the object? The radius of curvature of the mirror is r. Follow the sign conventions.

r. it should be placed at the same distance of the radius

When you look at a fish in a still stream from the bank, the fish appears shallower than it really is due to refraction. From directly above, it appears

shallower than its real depth.

image height is positive if, and the image height is negative if

the image is upright, the image is inverted (relative to the object)

object distance and image distance is positive if, and negative if

the image or object is in front of the mirror, the image or object is behind the mirror

in a CONCAVE mirror, if an image is inside the focal point, do<f, the image will be?

upright, larger, virtual

When the reflection of an object is seen in a flat mirror, the image is

virtual and upright.

for a diverging lens the image is always

virtual, upright, and smaller. and image s always on the same side as the object