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Physics 7C SS1 Lecture 5: Ray Optics Images Lens Types & Ray Tracing
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Review: Light at an Interface Activity 8.6.3 & 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
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Review: Light at an Interface Activity 8.6.3 & FNT 1 Incoming Ray Plastic prism n = 1.5 Which Ray? (a) (b) (c) Air n = 1
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Review: Light at an Interface Activity 8.6.3 & FNT 1 Incoming Ray Plastic prism n = 1.5 On leaving the prism, which way will the light bend? a) Upb) Downc) No bend
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What phenomenon most completely describes what you are seeing? a)Refraction b)Convergence c)Divergence d)Total Internal Reflection e)Snell’s Law
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What phenomenon most completely describes what you are seeing? a)Refraction b)Convergence c)Divergence d)Total Internal Reflection e)Snell’s Law
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Quiz 2
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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
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How will light emerge from the prism below? Incoming Rays a)Up b)Down c)Parallel d)Bent inward (converge) e)Bent outward (diverge)
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How will light emerge from the prism below? Incoming Rays a)Up b)Down c)Parallel d)Bent inward (converge) e)Bent outward (diverge)
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How will light emerge from the prism below? Incoming Rays a)Up b)Down c)Parallel d)Bent inward (converge) e)Bent outward (diverge)
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How will light emerge from the prism below? Incoming Rays a)Up b)Down c)Parallel d)Bent inward (converge) e)Bent outward (diverge)
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Parallel rays are uncommon…how do lenses work on regular objects?
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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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Every part of the tree reflects light, scattering it all directions. A ray diagram is used to simplify this picture.
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What type of image does Ernie make? a)Real b)Virtual c)Upright d)Inverted e)Bigger f)Smaller
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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
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c Focal point, f Object plane Image plane oi
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c Focal point, f Object plane o Where’s Ernie?
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c Focal point, f Object plane o i Image plane
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Where will the image be? How big will the image be?
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