Physics 102: Lecture 16 Introduction to Mirrors
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1 Physics 102: Lecture 16 Introduction to Mirrors Physics 102: Lecture 16, Slide 1
2 Physics 102 recent lectures Light as a wave Lecture 14 EM waves Lecture 15 Polarization Lecture 20 & 21 Interference & diffraction (coming soon!) Light as a ray Lecture 16 Reflection Lecture 17 Spherical mirrors & refraction Lecture 18 Refraction & lenses Lecture 19 Lenses & your eye Physics 102: Lecture 16, Slide 2
3 Light incident on an object Absorption Reflection (bounces) See it Mirrors Refraction (bends) Lenses Often some of each Physics 102: Lecture 16, Slide 3 Everything true for wavelengths << object size
4 Recall: wavefronts Wavefronts represent crests of EM wave y y y z x z z l Top view: l Direction of propagation x z Physics 102: Lecture 16, Slide 4
5 Huygens principle Every point on a wavefront acts as a source of tiny wavelets that move forward. Direction of propagation wavelet wavefront Physics 102: Lecture 16, Slide 5
6 Law of Reflection Incident wave Reflected wave q i q r Describe light as rays along direction of propagation of EM wave Angle of incidence = Angle of reflection q i = q r Physics 102: Lecture 16, Slide 6
7 Object Location Light rays from sun bounce off object and go in all directions Some hit your eyes We know object s location by where rays come from. Physics 102: Lecture 16, Slide 7
8 Flat Mirror All you see is what reaches your eyes You think object s location is where rays appear to come from. q r q i Smooth Mirror All rays originating from peak will appear to come from same point behind mirror! Physics 102: Lecture 16, Slide 8 Object Image
9 Flat Mirror (1) Draw first ray perpendicular to mirror 0 = q i = q r (2) Draw second ray at angle. q i = q r (3) Lines appear to intersect a distance d behind mirror. This is the image location. Light rays don t really converge there, so it s a Virtual Image q i q r Virtual: No light actually gets here Physics 102: Lecture 16, Slide 9 d d
10 Flat Mirror Summary Image appears: Upright Same size Located same distance from, but behind, mirror Facing opposite direction: Left/Right inverted Virtual Image: Light rays don t actually intersect at image location. Why do ambulances have AMBULANCE written backwards? Checkpoint 1.1 Physics 102: Lecture 16, Slide 10
11 Checkpoint 2.1 Can you see Fido s tail in mirror? (You) (Fido) Physics 102: Lecture 16, Slide 11
12 ACT/Two Mirrors How many images of money will you see (not including the actual money)? a. 1 b. 2 c. 3 d. 4 e. 5 Physics 102: Lecture 16, Slide 12
13 Curved mirrors A Spherical Mirror: section of a sphere. R light ray C Concave mirror principal axis C = Center of curvature Physics 102: Lecture 16, Slide 13 light ray principal axis In front of concave mirror, behind convex mirror. C Convex mirror
14 Checkpoint 2.1 An organic chemistry student accidentally drops a glass marble into a silver nitrate mirroring solution, making the outside of the marble reflective. What kind of mirror is this? (1) concave (2) convex (3) flat Physics 102: Lecture 16, Slide 14
15 Concave Mirror Principal Axis Focus f=r/2 Angle of incidence = angle of reflection. Thus rays are bent towards the principal axis. Rays parallel to principal axis and near the principal axis ( paraxial rays ) all reflect so they pass through the Focus (F). The distance from F to the center of the mirror is called the Focal Length (f). Physics 102: Lecture 16, Slide 15 f = R 2
16 What kind of spherical mirror can be used to start a fire? concave convex Checkpoint 3.2, 3.3 How far from the match to be ignited should the mirror be held? farther than the focal length closer than the focal length at the focal length Physics 102: Lecture 16, Slide 16
17 Concave Mirror F Principal Axis F Rays traveling through focus before hitting mirror are reflected parallel to Principal Axis. Rays traveling parallel to Principal Axis before hitting mirror are reflected through focus Physics 102: Lecture 16, Slide 17
18 Convex Mirror Principal Axis Focus f=-r/2 Rays are bent away from the principal axis. Rays parallel to principal axis and near the principal axis ( paraxial rays ) all reflect so they appear to originate from the Focus (F). The distance from F to the center of the mirror is called the Focal Length (f). f = R 2 Physics 102: Lecture 16, Slide 18
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