QCM : Fundamentals of Light and Optics — 9 questions

Explication

Wave-particle duality refers to the concept that light exhibits both wave-like behavior, such as interference and diffraction, and particle-like behavior, such as the photoelectric effect. This duality is fundamental to quantum physics, indicating that light cannot be described solely as a wave or solely as a particle, but rather exhibits properties of both depending on the experimental context.

Explication

The sheet states that the speed of light in a vacuum is approximately 3.00 x 10^8 m/s, which is a fundamental constant of nature. The other options are off by orders of magnitude, testing knowledge of this key number.

Explication

The Law of Reflection states that the angle of incidence equals the angle of reflection, both measured relative to the normal to the surface. This fundamental principle explains how light behaves when reflecting off surfaces, such as mirrors.

Explication

The wave model explains phenomena like interference and diffraction, which involve wave superposition. The photoelectric effect, on the other hand, is explained by the particle model of photons, so understanding this distinction helps differentiate the wave-particle duality.

Explication

Snell's Law provides a quantitative relationship between the angles of incidence and refraction and the refractive indices of the media involved. Its main function is to predict how much light will bend when crossing an interface between two media with different refractive indices. This makes it essential for understanding and calculating refraction phenomena, rather than just describing the qualitative aspects or other unrelated optical effects.

Explication

Specular reflection results in rays reflecting in a single, predictable direction, which produces clear images like in mirrors. Diffuse reflection, by contrast, scatters rays in many directions on rough surfaces.

Explication

Snell's Law, which relates the angles and refractive indices, is named after Willebrord Snell, making him the correct answer. The other figures are associated with different topics in optics and physics.

Explication

The photoelectric effect, where photons eject electrons from matter, is explained by the particle model, emphasizing photons as quantized packets of energy. Reflection and refraction are primarily explained by wave behavior.

Explication

The normal is an imaginary line perpendicular to the surface at the point of incidence, used as a reference for measuring incident and reflected angles, which is fundamental to applying the law of reflection.