According to Newton's corpuscular theory, what is light composed of and how does it travel?

Light consists of tiny particles (corpuscles) travelling in straight lines at high speed from a luminous source.

What type of waves did Huygens propose light consisted of, and what medium did he suggest they propagated through?

Huygens proposed that light consists of longitudinal waves propagating through an all-pervading medium called the aether.

How did Newton's corpuscular theory account for the rectilinear propagation of light?

Corpuscles travel in straight lines, naturally explaining why light travels in straight paths and casts sharp shadows.

Why did wave theory face difficulty explaining the rectilinear propagation of light and sharp shadows?

Wave theory struggled to explain why waves did not bend noticeably around obstacles, as diffraction was not yet understood.

How did Newton's corpuscular theory explain the reflection of light from surfaces?

Particles bounce off surfaces elastically, obeying the same laws as mechanical collisions.

What principle did Huygens use to explain the reflection of light?

Each point on a wavefront acts as a secondary source of wavelets, and the new wavefront formed by these wavelets explains reflection.

AQA A-Level Physics 7408

Measurements and Their Errors

Topic overview Use of SI units and their prefixes Limitation of physical measurements Estimation of physical quantities

Particles and Radiation

Topic overview Constituents of the atom Stable and unstable nuclei Particles, antiparticles and photons Particle interactions Classification of particles Quarks and antiquarks Applications of conservation laws The photoelectric effect Collisions of electrons with atoms Energy levels and photon emission Wave-particle duality

Waves

Topic overview Progressive waves Longitudinal and transverse waves Principle of superposition of waves and formation of stationary waves Interference Diffraction Refraction at a plane surface

Mechanics and Materials

Topic overview Scalars and vectors Moments Motion along a straight line Projectile motion Newton's laws of motion Momentum Work, energy and power Conservation of energy Bulk properties of solids The Young modulus

Electricity

Topic overview Basics of electricity Current–voltage characteristics Resistivity Circuits Potential divider Electromotive force and internal resistance

Further Mechanics and Thermal Physics

Topic overview Circular motion Simple harmonic motion (SHM)Simple harmonic systems Forced vibrations and resonance Thermal energy transfer Ideal gases Molecular kinetic theory model

Fields and Their Consequences

Topic overview Fields Newton's law Gravitational field strength Gravitational potential Orbits of planets and satellites Coulomb's law Electric field strength Electric potential Capacitance Parallel plate capacitor Energy stored by a capacitor Capacitor charge and discharge Magnetic flux density Moving charges in a magnetic field Magnetic flux and flux linkage Electromagnetic induction Alternating currents Transformers

Nuclear Physics

Topic overview Rutherford scattering α, β and γ radiation Radioactive decay Nuclear instability Nuclear radius Mass and energy Induced fission Safety aspects

AstrophysicsOptional topic

Topic overview Astronomical telescope consisting of two converging lenses Reflecting telescopes Single dish radio telescopes, I-R, U-V and X-ray telescopes Advantages of large diameter telescopes Classification by luminosity Absolute magnitude, M Classification by temperature, black-body radiation Principles of the use of stellar spectral classes The Hertzsprung-Russell (HR) diagram Supernovae, neutron stars and black holes Doppler effect Hubble's law Quasars Detection of exoplanets

Medical PhysicsOptional topic

Engineering PhysicsOptional topic

Topic overview Concept of moment of inertia Rotational kinetic energy Rotational motion Torque and angular acceleration Angular momentum Work and power First law of thermodynamics Non-flow processes The p–V diagram Engine cycles Second Law and engines Reversed heat engines

Turning Points in PhysicsOptional topic

Topic overview Cathode rays Thermionic emission of electrons Specific charge of the electron Principle of Millikan's determination of the electronic charge, e Newton's corpuscular theory of light Significance of Young's double slits experiment Electromagnetic waves The discovery of photoelectricity Wave–particle duality Electron microscopes The Michelson-Morley experiment Einstein's theory of special relativity Time dilation Length contraction Relativistic mass and energy

ElectronicsOptional topic

Topic overview MOSFET (metal-oxide semiconducting field-effect transistor)Zener diode Photodiode Hall effect sensor Difference between analogue and digital signals LC resonance filters The ideal operational amplifier Inverting amplifier configuration Non-inverting amplifier configuration Summing amplifier configuration Real operational amplifiers Combinational logic Sequential logic Astables Principles of communication systems Transmission media Time-division multiplexing Amplitude (AM) and frequency modulation (FM) techniques

Turning Points in Physics

Newton's corpuscular theory of light

3 things to know
Paper 3, section B

Overview

How the corpuscular theory explained reflection and refraction, and where it conflicted with wave theory.

What you need to know

Answer each one before you reveal it.

Your recallNot started

Numbers

How did each theory explain light travelling in straight lines and reflecting?

Key term

What opposing predictions did the two theories make about the speed of light in a dense medium?

Numbers

What non-scientific factor contributed significantly to the preference for Newton's corpuscular theory over Huygens' wave theory?

Questions from this subtopic

Each one with the model answer underneath.

1
According to Newton's corpuscular theory, what is light composed of and how does it travel?
Model answer
Light consists of tiny particles (corpuscles) travelling in straight lines at high speed from a luminous source.
2
What type of waves did Huygens propose light consisted of, and what medium did he suggest they propagated through?
Model answer
Huygens proposed that light consists of longitudinal waves propagating through an all-pervading medium called the aether.
3
How did Newton's corpuscular theory account for the rectilinear propagation of light?
Model answer
Corpuscles travel in straight lines, naturally explaining why light travels in straight paths and casts sharp shadows.
4
Why did wave theory face difficulty explaining the rectilinear propagation of light and sharp shadows?
Model answer
Wave theory struggled to explain why waves did not bend noticeably around obstacles, as diffraction was not yet understood.
5
How did Newton's corpuscular theory explain the reflection of light from surfaces?
Model answer
Particles bounce off surfaces elastically, obeying the same laws as mechanical collisions.
6
What principle did Huygens use to explain the reflection of light?
Model answer
Each point on a wavefront acts as a secondary source of wavelets, and the new wavefront formed by these wavelets explains reflection.

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