Based on the results of your lab, describe the following properties of the images formed: Your findings:Size Is the image larger or smaller than the object? Attitude Is the image upright or inverted? Location Is the image closer to the pinhole than the object? Or farther Draw a Diagram of what is happening: Homework: Research the human eye and the digital camera and answer the following questions for both technology: a)What part performs the function of the pinhole? b)What part performs the function of the screen? c)How is the image captured? d)How does the device accommodate for your lab results? LIGHT TRAVELS IN STRAIGHT LINES light light light Screen Pinhole 14
Reflection The Law of Reflection When a ray of light reflects off a surface, the angle of ___________ is equal to the angle of ___________. •When light rays reflect off of a smooth surface, they do so in the same pattern as the ___________ rays. oThis produces a ___________ image. •When light rays reflect off of an irregular or dull surface, the pattern of reflected rays is ___________ than the pattern of incident rays. oThis produces a __________ or unclear image. Complete the activities on this website to practice measuring angles with a protractor: What’s that law again? • ___________ reflection occurs when light is reflected off a smooth shiny surface • Because light travels in straight lines; o The angle that light strikes the surface (__________________________) is the same as the angle that light leaves the surface (__________________________). Terminology _________________ : light which travels towards the mirror __________________ : light which is reflected by (bounces off) the mirror ___________ : imaginary line drawn at 90 degrees to the mirror surface ________________________: angle between the incident ray and normal ________________________: angle between the reflected ray and normal Diagram Draw a diagram to explain the law of reflection in the space below. Figure 5. The law of reflection states that the angle of reflection is equal to the angle of incidence. Figure 6. Specular versus diffuse reflection. 15
Law of Reflection 1. The angle of reflection ____________ the angle of incidence. 2. The incident ray, reflected ray and normal all lie in the same _____________. Real or Virtual Image? In plane mirror reflection, a _____________ image is formed. A _____________ image is an image formed by rays that do not actually pass through the location of the image. Image Characteristics In optics, we will describe the characteristics of an image using the acronym L.O.S.T. L - ______________ O - ______________ (upright or inverted) S - ______________ (magnified, reduced, same size) T - ______________ (real or virtual) In the table below, write a summary of the image characteristics for a plane mirror. L O S T Figure 8. Image characteristics for a plane mirror. Homework Complete any parts of the Multiple Images lab not finished during class and make sure you fill out the table above. Figure 7. Virtual image produced by a plane mirror.
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- Spring '14
- Light, Total internal reflection, Geometrical optics, rays