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