Physics

1.

1 point

When an object is placed 25cm from a lens, a real image is formed. The image distance can be less
than 25 cm

True

False

2.

1 point

A near sighted person needs a diverging lens to correct her vision.

True

False

3.

1 point

Blue light passing through a double slit produces bright fringes on a viewing screen. If red light now
passes through the slits, the angular separation between bright fringes would decrease.

True

False

4.

1 point

When an object is placed 25 cm from a lens, a real image is formed. The lens must be
converging

True

False

5.

1 point

When an object is placed 20 cm rom a lens, a virtual image is formed. The lens must be
diverging.

True

False

6.

1 point

For a magnifying glass the image distance will be less than the object distance

True

False

7.

1 point

When an object is placed 15cm from a lens, a virtual image is formed. If the image is upright, the lens
must be a diverging lens.

True

False

8.

1 point

The term coherence refers to the polarization state of two waves

True

False

9.

1 point

Diffraction of light is important only for aperatures, openings, etc...that are very small compared to
the wavelenghts of light proceeding through them.

True

False

10.

1 point

When an object is placed 25cm from a lens, a real image is formed. The image may be reduced or
enlarged.

True

False

11.

1 point

Ray diagrams can only be used to find real images

True

False

12.

1 point

A magnifying lens when used properly yields a real, upright, enlarged image.

True

False

13.

1 point

A virtual image can be seen but must project on a screen

True

False

14.

1 point

The index of refraction for a given material may be less than one.

True

False

15.

1 point

A magnifying glass can only produce a virtual image.

True

False

16.

1 point

A converging lens has a negative focal length.

True

False

17.

1 point

Green laster light shines through a diffraction grating and produces bright fringes on a screen. When a
red laser light passes through the grating the bright fringes are closer together.

True

False

18.

1 point

When an object is placed 25 cm from a lens, a real image is formed. The image distance can be
less than 25 cm.

True

False

19.

1 point

The bending of light as it passes from one medium to another is due to a sudden change in frequency.

True

False

20.

1 point

White light enters a glass prism but color components of light are observed to emerge from the prism.
White light is separated into its color components by total internal reflection within the prism.

True

False

21.

1 point

A magnifying glass produces a virtual image

True

False

22.

1 point

A single diverging lens can only produce virtual images

True

False

23.

1 point

A single diverging lens cannot produce a real image.

True

False

24.

1 point

The intereference of electromagnetic waves is convincing evidence that they are transverse waves
rather than longitudinal waves

True

False

25.

1 point

If the distance between the slits in a Young double slit experiment is increased, the distance between
the bright fringes would increase.

True

False

26.

1 point

Red laser passes through a very narrow single slit to form a diffraction pattern. If the width of the slit
increased by a factor of two, the width of the central maximum is increased by a factor of two also.

True

False

27.

1 point

When an object is placed 15 cm from a lens a vertual image is formed. The lens must be a
diverging lens.

True

False

28.

1 point

For a double slit experiment, if the wavelength of light wire increased the angular separationof the
bright fringes would increase.

True

False

29.

1 point

A virtual image can be seen by projecting it on a screen

True

False

30.

1 point

In a diffraction grating, if the distance between the slits is increased, the angular separation
between the dark fringes would decrease.

True

False

31.

1 point

With single slit diffraction, if the slit width is increased, the width of the central maximum is
decreased

True

False

32.

1 point

For a double slit intereference patter, if the distance between the slits is increased, the separation
between the dark fringes increases also.

True

False

33.

1 point

The term dispersion refers to the index of refraction of certain materials depends on the angle of
incidence

True

False

34.

1 point

The fact that visible light can be reflected from a surface is convincing evidence that visible
light is a wave.

True

False

35.

1 point

A converging lens can only produce real images.

True

False

36.

1 point

If the distance between the slits in a Young double slit experiment is increased, the the angular
separation between the dark fringes would decrease

True

False

37.

1 point

A magnifying glass uses a diverging lens to produce an image.

True

False

38.

1 point

The critical angle is that angle at which all reflected light is polarized

True

False

39.

1 point

Red laser light passes through a single slit to form a diffraction patter. If the width of the slit increases,
the width of the central maximum decreases.

True

False

40.

1 point

For two slits, if the distance between slits were increases, the distance between the bright fringes would
increase.

True

False

41.

1 point

When an object is placed 15 cm from a lens, a virtual image is formed. The lens may be concave
or convex.

True

False

42.

1 point

For a double slit experiment, if the distance between the slits were increased the angular separation
of the bright fringes would increase.

True

False

43.

1 point

You can calculate the critical angle for a ray of light passing from air into glass.

True

False

44.

1 point

The dispersion refers to the fact that the index of refraction of certain materials depends on the
wavelength of light.

True

False

45.

1 point

The critical angle is that angle at which all reflected light is polarized

True

False

46.

1 point

A telescope consisting of a converging objective lens and a convering eyepiece lens produces a real
image to the eye.

True

False

47.

1 point

The eye does not distinquish real from virtual images

True

False

48.

1 point

The term dispersion refers to the fact that the inde of refraction of certain materials depends on the
wavelength of light

True

False

49.

1 point

The focal length of a lens is the same for all colors of light.

True

False

50.

1 point

An object is placed at the focal point of a convergin lens of focal lenghth f. The image distance is at
infinity.

True

False