Quick Quiz 1

You are standing about 2 m away from a mirror. The mirror has water spots on its surface. True or false: It is possible for you to see the water spots and your image both in focus at the same time.

Quick Quiz 2

You wish to reflect sunlight from a mirror onto some paper under a pile of wood in order to start a fire. Which would be the best choice for the type of mirror?

(a)flat (b)concave

(c)convex.

Quick Quiz 3

You are standing about 2 m away from a mirror. The mirror has water spots on its surface. True or false: It is possible for you to see the water spots and your image both in focus at the same time.

Quick Quiz 4

In Figure, what happens to the image point I as the object point O moves toward the right-hand surface of the material of index of refraction n1?

(a)It always remains between O and the surface, arriving at the surface just as O does.

(b)It moves toward the surface more slowly than O so that eventually O passes I.

(c)It approaches the surface and then moves to the right of the surface.

Quick Quiz 5

What is the focal length of a pane of window glass?

(a)zero (b)infinity

(c)the thickness of the glass (d)impossible to determine

Quick Quiz 6

A camera can be modeled as a simple converging lens that focuses an image on the film, acting as the screen. A camera is initially focused on a distant object. To focus the image of an object close to the camera, the lens must be

(a)moved away from the film. (b)left where it is.

(c)moved toward the film.

Quick Quiz 7

Two campers wish to start a fire during the day. One camper is nearsighted and one is farsighted. Whose glasses should be used to focus the Sun’s rays onto some paper to start the fire? (a)either camper

(b)the nearsighted camper

(c) the farsighted camper.

Quick Quiz 8

A particular nearsighted person is unable to see objects clearly when they are beyond 2.5 m away (the far point of this particular eye). What should the focal length be in a lens prescribed to correct this problem?

Course of lectures «Contemporary Physics: Part2»

Lecture №3

Interference of Light Waves. Conditions for Interference.Young's Double-Slit Experiment.

Intensity Distribution of the Double-Slit Interference Pattern. Phasor Addition of Waves. Change of Phase Due to Reflection. Interference in Thin Films. The Michelson Interferometer.

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