10/14 & 10/15 - 7 th grade agenda payday collect: hw: p.41- 44 mirrors & eye measuring...
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10/14 & 10/15 - 7th Grade Agenda
PaydayCollect: HW: p.41- 44Mirrors & EyeMeasuring Liquid Volume LabClass Reading: p. 60- 64HW: Workbook: p. 45- 48
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Reflection
• Reflection occurs when an object or wave bou_____ back off a surface through which it cannot pass.
nce
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Concave Mirror
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Convex Mirror
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Refraction
• Bending of light waves due to change in spe____ is known as refraction
ed
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Why does this pencil appear broken?
• Because light slowed down as it entered the glass as water
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Convex Lenses
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Concave Lenses produces smaller image
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Parts of the Eye
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Nearsightedness
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Farsightedness
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Graduated CylinderWhen measuring liquids in a graduated cylinder, the measurement should be taken at the bottom of the curve called the meniscus
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How much liquid is in this graduated cylinder?
• 52.8 ml
51525354
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How much liquid is in this graduated cylinder?
• 6.62 ml
6.26.46.66.8
7
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How much liquid is in this graduated cylinder?
• 11.5 ml
11121314
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What is the correct way to read a graduated cylinder?
A
B
CWhy?
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Is this a right way to take measurement from a graduated
cylinder?
• Why
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Measuring Liquid Volume Lab
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Galileo’s Telescope
• He was the first man to observe the moons of Jupiter and craters on the moons with a telescope in 1608
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What is a Refracting Telescope?
• A telescope that uses convex lenses to gather a large amount of light onto a small area
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What is a Reflecting Telescope?
• A telescope that uses mirrors to focus a large amount of light onto a small area
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What is the difference between refracting and reflecting
telescope?
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What is a Radio Telescope
• A telescope that uses curved, reflecting surfaces to concentrate faint radio waves from outer space onto small antennas
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Four views of the Crab Nebula using different telescopes