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    Refraction and Lenses Flashcards

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    Refraction and Lenses

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    Which must be included when drawing ray diagrams? Check all that apply.

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    focal point lens three easy rays axis

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    Cleo stated that light travels through air in straight paths, and when it moves from air to water, light changes direction, speeds up, and bends toward the normal.

    Which statement best describes Cleo's mistake?

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    Light slows down when it moves from air into water.

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    1/15 Created by sadlittlefarey

    Terms in this set (15)

    Which must be included when drawing ray diagrams? Check all that apply.

    focal point lens three easy rays axis

    Cleo stated that light travels through air in straight paths, and when it moves from air to water, light changes direction, speeds up, and bends toward the normal.

    Which statement best describes Cleo's mistake?

    Light slows down when it moves from air into water.

    Danny drew a ray diagram to show the image of a plastic bottle produced by a concave lens. Which describes how the bottle should appear in the diagram?

    The actual bottle should appear larger than the image of the bottle.

    Different kinds of lenses are used in eyeglasses to help people with eye conditions. Farsightedness is an eye condition in which distant objects appear clear but close objects appear blurry. Nearsightedness is an eye condition in which close objects appear clear but distant objects appear blurry.

    Which best describes the type of lens that would help someone with one of these eye conditions?

    Concave lenses would help someone who is nearsighted because the lenses make objects look smaller and closer.

    Which describes an image that can be produced by a concave lens?

    The image is virtual and smaller than the object.

    Which color of white light bends the most when it is refracted by a prism?


    Akio draws the ray diagram shown.

    Which best explains how to correct Akio's mistake?

    Move the small car so it appears on the left side of the lens.

    Samantha is viewing a real image formed by a lens of a diamond ring. Which must be true about the image?

    It is upside down.

    Olaf takes a picture of his dog using a digital camera. Which is true regarding the image of the dog detected by sensors in the camera?

    It forms where light rays coming from the dog converge.

    A(n) ______ image cannot be projected and forms where light rays appear to originate.


    Where do the three rays in a ray diagram start?

    at a single point on the object

    Roshan makes the table below to describe how to draw a ray diagram for a convex lens.

    What error did Roshan make?

    The ray that starts out parallel with the main axis should bend toward the axis and go through the focal point on the other side.

    The chart shows the densities of four substances.

    Which list shows the order in which white light passes through these substances, from fastest to slowest?

    Y, X, Z, W

    The diagram shows an image produced by a lens.

    At which point does the image appear?


    Franny drew a diagram to compare images produced by concave and convex lenses.

    Which belongs in the area marked X?


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    Verified questions


    When heat is added to a system of an ideal gas during the process of an isothermal expansion, (a) work is done by the system, (b) the internal energy increases, (c) work is done on the system, (d) the internal energy decreases.

    Verified answer PHYSICS

    A rectangle has length 3.24 m and height 0.532 m. To the correct number of significant figures, what is its area? A.

    1.72 \mathrm { m } ^ { 2 }

    1.72m 2 B.

    1.723 \mathrm { m } ^ { 2 }

    1.723m 2 C.

    1.7236 \mathrm { m } ^ { 2 }

    1.7236m 2 D.

    Source : quizlet.com

    Ray Diagrams for Lenses

    Ray Diagrams for Lenses

    The image formed by a single lens can be located and sized with three principal rays. Examples are given for converging and diverging lenses and for the cases where the object is inside and outside the principal focal length.

    The "three principal rays" which are used for visualizing the image location and size are:

    A ray from the top of the object proceeding parallel to the centerline perpendicular to the lens. Beyond the lens, it will pass through the principal focal point. For a negative lens, it will proceed from the lens as if it emanated from the focal point on the near side of the lens.

    A ray through the center of the lens, which will be undeflected. (Actually, it will be jogged downward on the near side of the lens and back up on the exit side of the lens, but the resulting slight offset is neglected for thin lenses.)

    A ray through the principal focal point on the near side of the lens. It will proceed parallel to the centerline upon exit from the lens. The third ray is not really needed, since the first two locate the image.

    Reversibility of object and image points: conjugate points

    Source : hyperphysics.phy-astr.gsu.edu



    PHYS 6.3: Optical elements: prisms, lenses and spherical mirrors

    PPLATO @

    PPLATO / FLAP (Flexible Learning Approach To Physics)

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    1 Opening items

    1.1 Module introduction

    You will probably be familiar with the action of a in splitting white light into the colours of the rainbow, or of a simple magnifying , or of the curved reflectors used in vanity mirrors, shaving mirrors and driving mirrors. This module describes these and introduces you to the equations which govern their operation and which can be used in their design. The operation of all these optical elements depends on the known behaviour of light rays when reflected from mirrors or refracted at the boundary between two transparent optical media. The magnifying glass is just one application of a and the mirrors listed above are examples of . An understanding of the action of these simple optical elements opens the way to an understanding of more complex instruments, such as telescopes, microscopes, camera lenses and projection systems, which are discussed in other modules.

    Section 2 describes refraction by a prism, using , and shows how prisms can be used to produce and total internal reflection. Section 3 describes refraction at a single spherical surface using a and introduces the for refraction at this surface and for refraction by a . The for a thin lens is introduced and the and the are derived. and behaviour is then discussed using this formula, and . The and of a lens are described, as is the process of image formation in a two–lens system.

    In Section 4 we extend these ideas to and using the same Cartesian sign convention. The is derived, and this is used with ray diagrams to discuss the operation and transverse magnification of spherical mirrors.

    It is interesting to note that although the fundamental principles of reflection and refraction were discovered nearly three hundred years ago, the subject has seen something of a renaissance recently with the advent of fast computer systems; complex lens systems can now be designed quickly. This has led to a resurgence of interest in optics in general and in particular to the use of optical components in advanced technology and physics research. However, this creates plenty of scope for gettings things wrong on an impressive scale, as was shown in the case of the Hubble space telescope. This was launched in 1990 and had a wrongly configured main mirror. The problem has now been corrected with the help of an additional optical system, installed in orbit by NASA astronauts.

    Study comment Having read the introduction you may feel that you are already familiar with the material covered by this module and that you do not need to study it. If so, try the following . If not, proceed directly to the Subsection.

    1.2 Fast track questions

    Study comment Can you answer the following ? If you answer the questions successfully you need only glance through the module before looking at the and the . If you are sure that you can meet each of these achievements, try the . If you have difficulty with only one or two of the questions you should follow the guidance given in the answers and read the relevant parts of the module. However, .

    Question F1

    Sketch a ray diagram to show how a thin convex lens can be used as a magnifying glass. Use your diagram to find the magnification if the object distance is 10 cm and the image distance is 25 cm?

    Question F2

    An extended object is placed 25 cm from a converging lens of focal length 10 cm. Use the thin lens equation to calculate the position of the image. Is the image real or virtual? What is the magnification? Draw a ray diagram to show the location of the image.

    Question F3

    A concave mirror has focal length of 10 cm. Draw a ray diagram to find the image position of an extended object placed 15 cm from the mirror. Confirm your result by direct calculation.

    Study comment Having seen the you may feel that it would be wiser to follow the normal route through the module and to proceed directly to the following Subsection.

    Alternatively, you may still be sufficiently comfortable with the material covered by the module to proceed directly to the .

    1.3 Ready to study?

    Study comment Throughout this module we will use for the propagation of light (i.e. the , neglecting any effects). We will use the of light at , and for the of light at an interface between two transparent materials of different . We will assume and use and the relationship between refractive index and the speed of light in the material.

    Mathematical requirements are mainly elementary and , the geometry of and especially the for , and . You should also be familiar with the use of and the solution of .

    If you are uncertain about any of these terms you can review them now by referring to the which will indicate where in they are developed.

    The following will allow you to establish whether you need to review some of the topics before embarking on this module.

    Question R1

    State the law of reflection for light rays at a plane mirror.

    Question R2

    A light ray passes from air into glass with refractive index 1.50. The angle of incidence is 15°, calculate the angle of refraction and the speed of the light inside the glass. (The speed of light in a vacuum is 3.0 × 108 m s−1).

    Question R3

    Source : www.physics.brocku.ca

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