Physics ch.23

What is the difference between a virtual image and a real image ?

A virtual image appears to be located where no light rays intersect, whereas a real image exists where light rays actually intersect

Which of the following do not suffer from chromatic aberration?

Concave mirrors

A mirror creates an image of an object; it is upright and appears to be slightly smaller than the object itself. What kind of mirror is it?

Convex

A clear plastic sandwich bag filled with water can act as a crude converging lens in air. If the bag is filled with air and placed under water, the effective lens is

Diverging. Because the index of refraction of the lens material is less than that of the sourrounding medium. Under these conditions, a biconvex lens will be divergent

True or false? The image of an object placed in front of a concave mirror is always upright

False because a concave mirror forms an inverted image when the object distance is greater than the focal length.

True or False? The height of the image of an object placed in front of a concave mirror must be smaller than or equal to the height of the object

False because the magnitude of the magnification produced by a concave mirror is greater than 1 of the object distance is less than the radius of curvature

True or false? An object is placed to the left of a converging lens. The image is always smaller or the same size as the object

False. A magnified, real image is formed if 2f>p>f and a magnified virtual image is formed of p<f

True or false? An object is placed to the left of a converging lens. The image is always to the right of the lens

False. Virtual image is formed on the left side of the lens of p<f

True or False l? The image of an object placed in front of a convex mirror is always upright and smaller than the object

True

True or false? An object is placed to the left of a converging lens. The image can be upright or inverted

True. Because an upright, virtual image is formed when p<f

The image created by a flat mirror alone is ?

Virtual, with a magnification M=1

A person spear fishing from a boat sees a fish located 3 m from the boat at an apparent depth of 1 m. To spear the fish, the person should aim --- the image of the fish.

below the image of the fish! The virtual image of the fish formed by refraction at the flat water surface is closer to the surface than is the fish.

When the Sun is setting with its bottom edge just touching the horizon,

the Sun is just below the horizon