12.82M

Category:

physics

Recording Notice. This lesson is being recorded

1.

Recording Notice
This lesson is
being recorded

3.

Explore 1: Lenses
Waves – Optics – Week 23

4.

Objectives
Keywords: concave, converging, convex, diverging, focal length, focus, magnification, real, virtual

Golden link
Post your answer in the poll.
EXTENSION for Explore 1 and 2: Questions from Week 23 PHY Explore 1 and 2 EXTENSION
- Waves - Optics (UK only).
When finished, post your score in the Q and A.
SLIDE:
5

6.

Starter
List these from large to small…
molecule
organism
sub-atomic
ecosystem
cells
atom
quarks
solar system
universe
galaxy
SLIDE:
6
planet

7.

Starter Solution
physics
universe
galaxy
solar system
planet
SLIDE:
7
organism
cells
molecule
particles
chemistry
physics
biology
ecosystem
atom
sub-atomic
quarks

8.

Video: History of the microscope
Microscope: The tube that changed the world 4.40 min
Poll: Who discovered the microscope?
SLIDE:
8

9.

Lenses formula – use the pen tool to write on the board.
SLIDE:
9

10.

Lenses formula – use the pen tool to write on the board.
Lens Power = 1 ÷ focal length
P = 1/f
Magnification = image height/object height
M = h1/h0
1/object distance + 1/image distance = 1/focal length
1/u + 1/v = 1/f
SLIDE:
10

11.

Breakout task: Complete these questions.
SLIDE:
11

12.

Breakout task: Analysing data
1/object distance + 1/image distance = 1/focal length
1/u + 1/v = 1/f
Describe how you will use the data you have collected to find the focal length f.
You will need to use a graph to find the value of f.
SLIDE:
12

13.

Breakout task: Analysing data
1/object distance + 1/image distance = 1/focal length
1/u + 1/v = 1/f
Describe how you will use the data you have collected to find the focal length f.
SLIDE:
13
You will need to use a graph to find the value of f.

14.

How a microscope works
The rays from the object are highly diverging.
Poll: What type of image is formed by this microscope?
Eyepiece
Objective
Object
Enlarged virtual image
SLIDE:
14

15.

X and
O O
X and
What to do…
Your teacher will split the class into 2 teams. Each team will be asked a question. If they get it right, they
can put an X or O on the grid. The first team to get 3 in a row wins!
SLIDE:
15

16.

Key Definitions
SLIDE:
16

17.

Plenary: Wordwall (quiz options)
https://wordwall.net/resource/6392099/physics/lenses
Post your score in the poll.
SLIDE:
17

18.

Objectives
Keywords: concave, converging, convex, diverging, focal length, focus, magnification, real, virtual

19.

Explore 2: Exam Practice
Waves – Optics – Week 23

20.

Objectives
Keywords: concave, converging, convex, diverging, focal length, focus, magnification, real, virtual
SLIDE:
20

21.

Starter
What behaviour of light makes a lens work?
Refraction
SLIDE:
21

22.

Q1
SLIDE:
22

23.

Q1
SLIDE:
23

24.

Q2
SLIDE:
24

25.

Q2
SLIDE:
25

26.

Q3
SLIDE:
26

27.

Q3
SLIDE:
27

28.

Q4
SLIDE:
28

29.

Q4
SLIDE:
29

30.

Q4
SLIDE:
30

31.

Q4
SLIDE:
31

32.

Q4
SLIDE:
32

33.

Q5
SLIDE:
33

34.

Q5
SLIDE:
34

35.

Plenary
What is a virtual image?
An image that cannot be projected.
It is as though the rays came from here.
SLIDE:
35

36.

Objectives
Keywords: concave, converging, convex, diverging, focal length, focus, magnification, real, virtual

37.

Explore 3: Practical
Waves – Optics – Week 23

38.

Objectives
Keywords: concave, converging, convex, diverging, focal length, focus, magnification, real, virtual

39.

Starter
Poll: What is a synonym for refraction?
Answer
Bending
SLIDE:
39

40.

Collecting data to find focal length f
1/object distance + 1/image distance = 1/focal length
1/u + 1/v = 1/f
Describe how you will use the data you have collected to find the focal length f.
SLIDE:
40
You will need to use a graph to find the value of f.