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Physics 7C SS1 Lecture 5: Ray Optics Images Lens Types & Ray Tracing.

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Presentation on theme: "Physics 7C SS1 Lecture 5: Ray Optics Images Lens Types & Ray Tracing."— Presentation transcript:

1 Physics 7C SS1 Lecture 5: Ray Optics Images Lens Types & Ray Tracing

2 Review: Light at an Interface Activity & FNT 1 Incoming Ray Plastic prism n = 1.5 On entering the prism (first boundary), which way will the light bend? a) Upb) Downc) No bend Air n = 1

3 Review: Light at an Interface Activity & FNT 1 Incoming Ray Plastic prism n = 1.5 Which Ray? (a) (b) (c) Air n = 1

4 Review: Light at an Interface Activity & FNT 1 Incoming Ray Plastic prism n = 1.5 On leaving the prism, which way will the light bend? a) Upb) Downc) No bend

5 What phenomenon most completely describes what you are seeing? a)Refraction b)Convergence c)Divergence d)Total Internal Reflection e)Snell’s Law

6 What phenomenon most completely describes what you are seeing? a)Refraction b)Convergence c)Divergence d)Total Internal Reflection e)Snell’s Law

7 Quiz 2

8 Terms in Optics Concepts: Object Image Real Virtual Upright Inverted Magnification Focus Ways to locate Image: Thin Lens Equation Image distance Object distance Sign of lens Ray Tracing Principal Rays Lens Types: Converging Diverging Convex Concave

9 How will light emerge from the prism below? Incoming Rays a)Up b)Down c)Parallel d)Bent inward (converge) e)Bent outward (diverge)

10 How will light emerge from the prism below? Incoming Rays a)Up b)Down c)Parallel d)Bent inward (converge) e)Bent outward (diverge)

11 How will light emerge from the prism below? Incoming Rays a)Up b)Down c)Parallel d)Bent inward (converge) e)Bent outward (diverge)

12 How will light emerge from the prism below? Incoming Rays a)Up b)Down c)Parallel d)Bent inward (converge) e)Bent outward (diverge)

13 Parallel rays are uncommon…how do lenses work on regular objects?

14 Diffuse reflection: rough surface reflects light in many directions. Still obeys law of reflection, just scatters at many different angles. Even flat surfaces like paper are not smooth to visible light. A flashlight beam shining on paper can be seen from most angles, not just the one complimentary to the incident. Paper

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17 Every part of the tree reflects light, scattering it all directions. A ray diagram is used to simplify this picture.

18 What type of image does Ernie make? a)Real b)Virtual c)Upright d)Inverted e)Bigger f)Smaller

19 What type of image does Ernie make? a)Real b)Virtual c)Upright d)Inverted e)Bigger f)Smaller Lens far away: He was inverted and real Lens close to him: He was upright and virtual

20 c Focal point, f Object plane Image plane oi

21 c Focal point, f Object plane o Where’s Ernie?

22 c Focal point, f Object plane o i Image plane

23 Where will the image be? How big will the image be?


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