lecture20 - Physics 102: Lecture 20 Interference Unaided...

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Unformatted text preview: Physics 102: Lecture 20 Interference Unaided Eye Bring object as close as possible (to near point d near ) How big the object looks with unaided eye. ** If is small and expressed in radians. o near h d tan( ) o near h d = 47 object d near h Angular Size Preflight 19.6, 19.7 Angular size tells you how large the image is on your retina, and how big it appears to be. How small of font can you read? Highwire Caramel Apples Rabbits Kindergarten Hello Arboretum Hal owe n Amazing 46 Both are same size, but nearer one looks bigger. / = h i d i = h o d o Magnifying glass produces virtual image behind object, allowing you to bring object to a closer d o : and larger Compare to unaided eye: : near h d = Ratio of the two angles is the angular magnification M: o o near o near o h d d M h d d = = = Magnifying Glass 48 / object virtual image h i h o d i d o magnifying glass M = d near /d = d near /f +1 1 1 1 o near d f d = + For max. magnification, put image at d near : so set d i = -d near : Angular Magnification 50 / object virtual image h i h o d o magnifying glass (d near = near point distance from eye.) d i Smaller f means larger magnification See text, Example 24.6 o o near o near o h d d M h d d = = = For the lens: 1 d o + 1 d i = 1 f 1 d o = 1 f- 1 d i Phys 102 recent lectures Lecture 14 EM waves Lecture 15 Polarization Lecture 20 & 21 Interference & diffraction Lecture 16 Reflection Lecture 17 Spherical mirrors & refraction Lecture 18 Refraction & lenses (today!) Lecture 19 Lenses & your eye Light as a wave Light as a ray Superposition t +1-1 t +1-1 t +2-2 + Constructive Interference In Phase 5 Superposition t +1-1 t +1-1 t +2-2 + Destructive Interference 7 Out of Phase 180 degrees Superposition ACT...
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lecture20 - Physics 102: Lecture 20 Interference Unaided...

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