Reading quizzes

Question 1

A ray of light passes from one material into a material with a higher index of refraction. What happens to the ray’s angle with the normal? (increase, decrease, or remain unchanged)

Answer 1

decrease

Question 2

A ray of light passes from one material into a material with a higher index of refraction. What happens to the light’s wavelength? (increase, decrease, or remain unchanged)

Answer 2

decrease

Question 3

A ray of light passes from one material into a material with a higher index of refraction. What happens to the light’s frequency? (increase, decrease, or remain unchanged)

Answer 3

remain unchanged

Question 4

A ray of light passes from one material into a material with a higher index of refraction. What happens to the light’s speed? (increase, decrease, or remain unchanged)

Answer 4

decrease

Question 5

A ray of light passes from one material into a material with a higher index of refraction. What happens to the photon’s energy? (increase, decrease, or remain unchanged)

Answer 5

remain unchanged

Question 6

True or false? The angle theta in snell’s law is measured between the ray and a line perpendicular to the surface

Answer 6

true

Question 7

True or false? The speed of light in a material increases as the material’s index of refraction increases.

Answer 7

False

Question 8

the ratio (v/lambda) of a photon’s speed to its wavelength has the same value for any index of refraction (n).

Answer 8

True

Question 9

True or false? photons of blue light have a higher energy than photons of red light.

Answer 9

True

Question 10

True or false? A photon’s energy depends on its brightness.

Answer 10

False

Question 11

Light in medium A undergoes a total internal reflection as it reaches the interface with medim B. Which of the following statements must be true?

Answer 11

light traveling in the opposite direction, from B into A, cannot undergo a total internal reflection.

nB < nA

Question 12

What is true about a beam of white light refracted through any prism in terms of color order?

Answer 12

Red will always be ‘on top’ (deviate the least from the original path) while the other colors will be closer and closer to the normal

Question 13

True or false? For an object at a concave mirror’s center of curvature, the image is real and inverted.

Answer 13

True

Question 14

True or false? As an object approaches the focal point of a concave mirror, the image size shrinks to zero.

Answer 14

False

Question 15

For an object in front of a convex mirror, the image is always virtual and upright. True or false?

Answer 15

True

Question 16

True or false? For any object in front of a diverging lens, the image is virtual and in front of the lens.

Answer 16

True

Question 17

A converging lens always forms a real image and a diverging lens always forms a virtual image. True or false?

Answer 17

False

Question 18

For an object located at the focal point of any lens the image has a magnification equal to one. True or false?

Answer 18

False

Question 19

Suppose you want to use a converging lens to project the image of two trees onto a screen. One tree is a distance x from the lens, while the other is a distance of 2x. You adjust the screen so that the near tree is in focus. If you now want the far tree to be in focus, do you move the screen towards or away from the lens?

Answer 19

Towards the lens

Question 20

Light from an object passes through a lens and forms a visible image on a screen. If the screen is removed, would you be able to see the image if you remained in your present position?

Answer 20

No

Question 21

Light from an object passes through a lens and forms a visible image on a screen. Would you be able to see the image if you could look at the lens along its axis, beyond the original position of the screen?

Answer 21

Yes

Question 22

What do we know about the image created by a flat mirror?

Answer 22

It is always virtual and upright

Question 23

In a single-slt diffraction experiment, as the width of the slit is made smaller, what happens to the width of the central maximum of the diffraction pattern?

Answer 23

It becomes larger

Question 24

In a two-slit interference pattern projected on a screen, the fringes are equally spaced where?

Answer 24

only for small angles

Question 25

Suppose young's experiment is carried out in air, then, underwater. In what way does the distance between bright fringes change?

Answer 25

They move closer together

Question 26

If laser light is reflected from a phonograph record or a compact disc, a diffraction pattern appears. The pattern arises because both devices contain parallel tracks of information that act as a reflection grating. Which device, record or CD, results in diffraction maxima that are farther apart?

Answer 26

the CD

Question 27

Young's double slit experiment is performed with three different colors of light, R, G, and B. Rank the colors by the distance between adjacent bright fringes, from smallest to largest.

Answer 27

Blue, green, red ym=(lambdaL/d)m

Question 28

If the distance between the slits is doubled in young's experiment, what happens to the width of the central maximum?

Answer 28

The width is halved

Question 29

A plane monochromatic light wave is incident on a double-slit as illustrated in the figure below. If the viewing screen is moved away from the double slit, what happens to the separation between the interference fringes on the screen?

Answer 29

it increases

Question 30

A plane monochromatic light wave is incident on a double-slit as illustrated in the figure below. As the slit separation decreases, what happens to the separation between the interference fringes on the screen?

Answer 30

it increases

Question 31

If young's double slit experiment carried out in air is repeated under water, would the distance between the bright fringes increase, decrease, or remain the same?

Answer 31

decrease ym=(lambdaL/d)m

Question 32

Sodium's emission lines at 589.0nm and 589.6 nm pass through a diffraction grating and form two m= +1 maxima on a viewing screen. Would the spacing between the lines increase, decrease or remain unchanged if the grating is exchanged for one having fewer lines per millimeter?

Answer 32

the spacing decreases

Question 33

Sodium's emission lines at 589.0nm and 589.6 nm pass through a diffraction grating and form two m= +1 maxima on a viewing screen. Would the spacing between the lines increase, decrease or remain unchanged if the grating is exchanged for one with twice the total number of lines (the number of lines per millimeter is the same)

Answer 33

the spacing remains unchanged

Question 34

Sodium's emission lines at 589.0nm and 589.6 nm pass through a diffraction grating and form two m= +1 maxima on a viewing screen. Would the spacing between the lines increase, decrease or remain unchanged if the intensity of the light is doubled

Answer 34

the spacing remains unchanged

Question 35

Sodium's emission lines at 589.0nm and 589.6 nm pass through a diffraction grating and form two m= +1 maxima on a viewing screen. Would the spacing between the lines increase, decrease or remain unchanged if the maxima are viewed in second order?

Answer 35

The spacing increases

Question 36

What is required for a 180 phase reversal?

Answer 36

for the light to be reflected off of a surface with a higher index of refraction than the medium the light is in. (n1

Question 37

A CCD camera is equipped with a lens with constant focal-length. as the f-number is decreased, determine if the aperture increases, decreases or remains the same.

Answer 37

increases (note that the f number is f/D, D is the diameter of the lens)

Question 38

A CCD camera is equipped with a lens with constant focal-length. as the f-number is decreased, determine if the depth of field increases, decreases or remains unchanged

Answer 38

decreases

Question 39

A CCD camera is equipped with a lens with constant focal-length. as the f-number is decreased, determine if the intensity of the light reaching the sensor increases, decreases or remains unchanged

Answer 39

increases

Question 40

A CCD camera is equipped with a lens with constant focal-length. as the f-number is decreased, determine if the appropriate exposure time increases, decreases, or remains unchanged

Answer 40

decreases (as the aperture decreases, the exposure time goes down to prevent the image from becoming overexposed)

Question 41

for a nearsighted person, the _____ is always located closer than ______ from the eye and the corrective lens is _____

Answer 41

far point, infinity, diverging

Question 42

for a farsighted person, the _____ is always located farther than ______ from the eye and the corrective lens is _____

Answer 42

near point, 25 cm, converging

Question 43

A patient has a near point of 1.25m. Is she near or farsighted? What should the corrective lens be?

Answer 43

she is farsighted and needs a converging lens

Question 44

suppose a microscope's resolution is diffraction limited. which one of the following changes would provide the greatest improvement to its resolution?

Answer 44

observing at a shorter wavelength through a larger aperture thetamin = 1.22lambda/D (diameter) want theta minumum to be the LEAST

Question 45

if you increase the aperture diameter of a camera by a factor of three, how is the intensity of the light striking the film affected?

Answer 45

it increases by a factor of 9 (I = D^2/f^2)