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Introduction
Introduction
Light travels as transverse waves and faster than sound. It can be reflected, refracted and dispersed. In this topic, you will draw ray diagrams to show what happens to light in mirrors and lenses.
Task 1: Know
Task 1: Know
Task 1: Use look, cover, write check to learn the answers to the core questions and the keywords for this topic
Learn
Learn
Task 2: The Electromagnetic Spectrum
Task 2: The Electromagnetic Spectrum
Task 2c: Make notes that:
Draw the diagram fon the left in the centre of your page
Annotate the diagram with the uses of each type of radiation
Annotate the diagram with the dangers of each type of radiation
Give the equation for calculating wave speed, including units
Give the speed of light in air
Complete the calculations on slide 27, check your answers on slide 28
Task 2d: Calculate wave speed for the following. Show full workings:
A frequency of 5Hz and a wavelength of 10m
A frequency of 2kHz and a wavelength of 4m (hint: 1kHz = 1000Hz)
A frequency of 5Hz and a wavelength of 50cm (hint: 100cm = 1m)
50m/s
8000m/s
2.5m/s
Task 2e: Calculate:
The speed of a wave with a frequency of 10kHz and a wavelength of 2m.
The speed of a wave with a wavelength of 50cm and a frequency of 4kHz
The frequency of a wave travelling at 500m/s with a wavelength of 25m
The speed of a radio wave with a wavelength of 10,000m and a frequency of 100kHz
The speed of a wave with a frequency of 30MHz and wavelength of 10m
The wavelength of a wave travelling at 11km/s with a frequency of 5.5kHz
20,000m/s
2000m/s
20Hz
1,000,000,000m/s
300,000,000m/s
2m
Task 3: Transmission and absorption
Task 3: Transmission and absorption
Task 3c: Make notes that:
List the 3 things that can happen when light hits an object
Give a definition for each
Define:
Transparent
Translucent
Opaque
Draw ray diagrams to show:
Light being reflected by a mirror
Light being absorbed by a brick
Light being transmitted by glass
Define an eclipse. Keywords to use: Sun, moon, light, move, absorb, transmit, reflect
Draw a ray diagram to explain what happens during an eclipse
Task 4: Reflecting light
Task 4: Reflecting light
Task 4c: Make notes that:
Define the ‘normal line’.
Draw a diagram to illustrate this.
Add the incident ray onto your diagram. Ensure it is labelled.
Add the reflected ray onto your diagram. Ensure it is labelled.
Label the angle of incidence.
Label the angle of reflection.
Describe the relationship between these two angles.
Explain how mirrors can be helpful. Give specific examples.
Task 5: Refracting light
Task 5: Refracting light
Task 5c: Make notes that:
Draw a labelled diagram to show the refraction of light through a block. Include: the normal line, incident ray, refracted ray, angle of incidence and angle of refraction
Describe the relationship between the angle of incidence and the angle of refraction when light enters a:
More dense medium
Less dense medium
Copy the sentences on the right and fill in the blanks, check your answers on slide 21
When light changes direction this is called _______.
This happens because the light changes _______.
When light enters a ______ dense medium [e.g. glass], it bends _______ the normal. This is because the speed of the light ________.
When light enters a _______ dense medium [e.g. air], it bends _____ _____ the normal. This is because the speed of the light ________.
Task 6: Colours of light
Task 6: Colours of light
Task 6c: Make notes that:
Draw and label a diagram to show the splitting of light through a prism
Explain how a rainbow is made
Explain how we see objects as coloured
Explain how we see objects as black
Explain why if you shine yellow light on a green object, the object appears to be green
Task 6d: Complete the exam questions and mark your answers
Task 7: Lenses
Task 7: Lenses
Task 7b: Make notes that:
Explain how the eye changes focus
Define focal point
Define focal length
Draw a diagram to show the focal point and focal length of a lens
Explain how the thickness of the lens affects focal length
Suggest whether the lens in your eye becomes thick or thin if an object is:
Near to your eye
Far from your eye
Task 8: How eyes work
Task 8: How eyes work
Task 8c: Make notes that:
Draw a labelled diagram of the eye
Give the function of each part of the eye
Describe how the eye works
Task 9: Summarise
Task 9: Summarise
Task 9a: Watch the videos
Task 9b: Complete the seneca learningfor this unit:
Task 9c: Copy and complete the single page summary on the right. Once you are done add it to your revision folder.
Check
Check
Task 10: Complete the quiz to make sure you understand this unit.
Extension
Extension
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