1. Wednesday, April 17
Today's Objective: Observe ways that lenses refract light and bring objects into focus to form various images.
Due today -
Monday's assignment: Concepts Practice wksht
Lenses/Optics Lab that you started yesterday.
Reminders -
Big test next week: waves/vibrations, sound, and light (Chapters 25-31)
Portfolios will be due the day of the test.
this coming Friday is a half-day.

2. How lenses work

3. Reminders for today's Optics lab:
First Part - use the meter stick apparatus to measure the focal length of a lens
(note: focal lengths are typically measured in mm;
ie, distance of eyeglasses to retina).
Second Part - use the optic kits (located on the counter) and a colored light to focus the letter "F" on the screen block (the screen block will have to be set several cm off the top of the kit).
Third Part - Calculate the magnification of a lens - simply use one of the scraps of graph paper on the counter.

4. Reminders for Today: Finish the optics lab from yesterday.
Demonstrate how a converging lens operates by drawing proper ray diagrams.
Complete today's worksheet: Ch. 30 Lenses
Turn in any other previous assignments.
Objective: Observe ways that lenses refract light and bring objects into focus to form various images.