# Physics Unit 13 Light and Optics

Lesson 1:
New section in notes Title: Properties of light.
Warm up: Write 3 things you know about light – discuss, be sure to include spectrum
Show video on E & M fields in light ref:
Students draw x-y-z sketch of fields in notes

Lesson 2:
Speed of light is constant, 3 x 10^8 m/s
calculate time for light to reach earth from the sun (93million miles = 150,000,000 miles)
calculate distance light travels in 1 year (9.46×10^15m = 1 light-year)
2.4×1020 Distance from Sun to galactic center — calculate time for light to reach us from the galactic center

The spectrum: see post ref :
Lesson 3:
Warm Ups and CBQ’s (Classwork Board Quiz)
Warm Ups: 5 pts: Qualitative question – on index card
CBQ’s: 10 pts : Q (or Q’s) posted on board:

CBQ: Mirror Equation:Find image distance.

http://lesson-plans.math-science-resources.com/cbq-mirror-equations/
1] f = 15, p = 25 use 1/f = 1/p + 1/q –> 1/q = 1/f – 1/p (ans: 37.5 or 38)
2] f = 15, p = 30 note p = 2 * f so p = C, q = C = 30
3] f = 15, p = 15 object is at focal point so image is not defined (1/q = 1/15 – 1/15 = 0, q = 1/0)
4] f = 15, p = 10 object is inside focal point so image distance is negative, 1/q = 1/15 – 1/10 = (2-3)/30 = -1/30, q = -30
Unit 13: quiz

Physics Unit 13 Quiz