10/14 & 10/15 - 7th Grade Agenda Payday Collect: HW: p

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10/14 & 10/15 - 7th Grade Agenda Payday Collect: HW: p.41- 44 Mirrors & Eye Measuring Liquid Volume Lab Class Reading: p. 60- 64 HW: 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 Cylinder When 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 54 53 52 51

How much liquid is in this graduated cylinder? 6.62 ml 7 6.8 6.6 6.4 6.2

How much liquid is in this graduated cylinder? 11.5 ml 14 13 12 11

What is the correct way to read a graduated cylinder? B C Why?

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