Test 2 Concepts

Question 1

If you stand in front of a plane mirror, the image you see is…

Answer 1

virtual

Question 2

If a mirror forms a virtual image of an object, the image distance is defined to be..

Answer 2

negative

Question 3

a concave mirror of focal length=1 is oriented so that the rays of the sun are incident on it, what type of image of the sun is created?

Answer 3

A real image 1m in front of the sunny side of the mirror.

Question 4

A rock is sitting at the bottom of a beaker filled with oil. If you view the beaker and rock from above the beaker, the rock…

Answer 4

Appears closer to the surface than it actually is. B/c the oil is more dense than air, which changes the apparent position.

Question 5

If you shine a laser through a glass wall of an aquarium so that it becomes perpendicular to the wall (theta=0), what direction does it travel through the water at?

Answer 5

also perpendicular via snell’s law.

Question 6

If light is traveling through two transparent materials, what is the relationship between their n’s if there is total internal reflection?

Answer 6

n1 is greater than n2, the angle of refraction bends towards the normal (becomes 0) in a less dense material.

Question 7

In two-slit interference, to increase the number of bright interference maxima on the screen you have to…b/c…

Answer 7

decrease the size of the slits being used. b/c a small slit corresponds to a larger region of overlap, which then will contain more bright spots.

Question 8

The resolution of an optical device can be improved by _____ the lens diameter.

Answer 8

increasing - b/c the minimum angle at which the lens can distinguish two objects is lessened with an increased value of D.

Question 9

In a thin-film problem, if n1<n3, what colors of light will undergo constructive interference?

Answer 9

All colors of visible light b/c the light undergoes two phase shifts, and thus all the colors are in phase and constructive.