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Recording Notice
This lesson is
being recorded

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King’s Interhigh Logo

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Explore 1: Lenses
Waves – Optics – Week 23

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

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

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

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Video: History of the microscope
Microscope: The tube that changed the world 4.40 min
Poll: Who discovered the microscope?
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Lenses formula – use the pen tool to write on the board.
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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
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Breakout task: Complete these questions.
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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.
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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.
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You will need to use a graph to find the value of f.

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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
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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!
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Key Definitions
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Plenary: Wordwall (quiz options)
https://wordwall.net/resource/6392099/physics/lenses
Post your score in the poll.
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Objectives
Keywords: concave, converging, convex, diverging, focal length, focus, magnification, real, virtual

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Explore 2: Exam Practice
Waves – Optics – Week 23

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Objectives
Keywords: concave, converging, convex, diverging, focal length, focus, magnification, real, virtual
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Starter
What behaviour of light makes a lens work?
Refraction
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Q1
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Q1
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Q2
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Q2
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Q3
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Q3
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Q4
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Q4
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Q4
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Q4
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Q4
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Q5
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Q5
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Plenary
What is a virtual image?
An image that cannot be projected.
It is as though the rays came from here.
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Objectives
Keywords: concave, converging, convex, diverging, focal length, focus, magnification, real, virtual

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Explore 3: Practical
Waves – Optics – Week 23

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

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Starter
Poll: What is a synonym for refraction?
Answer
Bending
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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.
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You will need to use a graph to find the value of f.

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Find the focal length of the lens. Use 80 cm curvature.
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Plenary
Poll: What are the two ways of adjusting lens power?
Answer
Refractive index
Curvature
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Objectives
Keywords: concave, converging, convex, diverging, focal length, focus, magnification, real, virtual

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Explore 4: Exam Practice
Waves – Optics – Week 23

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

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Starter
Pictionary
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Q1
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Q1
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Q2
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Q2
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Q3
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Q3
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Q3
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Q4
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Q4
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Q5
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Q5
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Q6
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Q6
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Plenary
More Pictionary
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Objectives
Keywords: concave, converging, convex, diverging, focal length, focus, magnification, real, virtual

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Lesson complete!
See you next lesson