Key term
CCEA A-Level Physics 1210
Physical Quantities, Scalars and Vectors
Moments and Equilibrium
Linear Motion and Dynamics
Newton's Laws of Motion
Linear Momentum and Impulse
Work, Energy and Power
Current, Charge and Potential Difference
Resistance and Resistivity
Topic overviewResistance and Ohm's lawOhmic and non-ohmic behaviourResistors in series and in parallelInvestigating current, voltage and resistance in series and parallel circuitsElectrical power and energy in resistive circuitsResistivity and the equation R = ρl/AMeasuring the resistivity of a metalCurrent–voltage characteristics of a conductor, a lamp and a diodeResistance, temperature and superconductivity
Internal Resistance and Potential Dividers
Topic overviewInternal resistance and terminal potential differenceConsequences of internal resistance for external circuitsMeasuring electromotive force and internal resistanceThe potential divider and variable outputPotential dividers in lighting and heating control circuitsLoaded potential dividers and output voltage calculations
Waves
Refraction
Lenses
Superposition, Interference and Diffraction
Topic overviewSuperposition of wavesStanding waves, nodes and antinodesStanding waves on stretched stringsStanding waves in a pipe closed at one endMeasuring the speed of sound with a resonance tubeConditions for observable interferencePath difference and phase differenceYoung's double slitDiffraction at a single slitThe diffraction grating
Quantum Physics
Wave-Particle Duality
Astronomy
Practical Skills and Data Analysis
Topic overviewChoosing and using measuring instrumentsPrecision, accuracy and recording measurementsUsing the cathode ray oscilloscope to measure voltage and frequencyTables, graphs and presenting resultsLinearising a relationship and using the gradientAbsolute and percentage uncertaintyCombining uncertainties and uncertainty on a graphRandom and systematic error, reliability and refining an experiment
Deformation of Solids
Thermal Physics
Topic overviewBoyle's law, Charles's law and the pressure lawThe ideal gas equation pV = nRTThe Avogadro constant, the mole and pV = NkTInternal energy and the distribution of molecular energyThe kinetic theory equation pV = ⅓Nm⟨c²⟩Average molecular kinetic energy and temperatureAbsolute zero and the kelvin scaleSpecific heat capacity and the electrical method
Uniform Circular Motion
Simple Harmonic Motion
Topic overviewDefining simple harmonic motion and a = −ω²xDisplacement, velocity and acceleration: x = A cos ωtThe simple pendulum and T = 2π√(l/g)The loaded spiral spring and T = 2π√(m/k)SHM graphs and finding velocity from a gradientFree vibrations, forced vibrations and resonanceDamping: light, critical and over-damping
The Nucleus and Radioactive Decay
Topic overviewAlpha-particle scattering and the nuclear atomNuclear radius and nucleon numberThe density of nuclear matterAlpha, beta and gamma radiation: nature, penetration and rangeNuclear equations and changes in nucleon and proton numberThe random and exponential nature of radioactive decayActivity, the decay constant and A = −λNExponential decay calculations with A = A₀e^(−λt)Half-life and measuring it
Nuclear Energy, Fission and Fusion
Gravitational Fields
Electric Fields
Capacitors
Magnetic Fields
Charged Particles and Accelerators
Lenses
Images formed by lenses
- 3 things to know
- Unit AS 2
Overview
Real image and virtual image.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
How does an observer see the virtual image produced by a magnifying glass?
Key term
What arrangement of object and lens is used in a camera, and what kind of image results?
Questions from this subtopic
Each one with the model answer underneath.
- 1
Which three standard rays are used to locate the image formed by a converging lens?
Model answer
A ray from the top of the object parallel to the axis that passes through the principal focus after the lens, a ray through the optical centre that carries straight on, and a ray through the principal focus in front of the lens that emerges parallel to the axis.
- 2
Define a real image.
Model answer
A real image is one formed where rays of light actually cross, so it can be caught on a screen placed at that position.
- 3
Define a virtual image.
Model answer
A virtual image is one from which the rays only appear to diverge, so no light actually reaches its position and it cannot be caught on a screen.
- 4
An object is placed further from a converging lens than twice its focal length. Describe the image.
Model answer
The image is real, inverted and smaller than the object, and it lies between the principal focus and twice the focal length on the far side of the lens.
- 5
An object is placed at exactly twice the focal length from a converging lens. Describe the image.
Model answer
The image is real, inverted and exactly the same size as the object, and it lies at twice the focal length on the far side of the lens.
- 6
An object is placed between the principal focus and twice the focal length of a converging lens. Describe the image.
Model answer
The image is real, inverted and larger than the object, and it lies beyond twice the focal length on the far side of the lens.
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