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