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A ray of light is reflected or refracted at the boundary of two mediums with different refractive indices.
reflection of light, refraction, reflection, Snell-Descartes law, normal, refractive index, boundary, angle of incidence, ray of light, angle of refraction, angle of reflection, light, optical depth, photon, reflected, optics, physics
The curvature of the lens of the eye changes when we look at a distant or at a near object, to ensure a sharp image.
Physical properties, as well as the flora and fauna of the ocean change with depth.
Observatories are often built at high elevations to minimise the effects of atmospheric turbulence
A wide variety of optical instruments are in use today, ranging from microscopes to telescopes.
During its orbit around the Earth, the visibility of the Moon's illuminated part constantly changes.
When the Sun, Earth, and the Moon are arranged in a straight line, the Moon can partially or completely obscure the Sun.
The eye is one of our most important sense organs. When stimulated by light, electric impulses are produced by its receptors.
This animation explains transparency and opacity, the principle of radiography, and the light-absorbing properties of materials.
Concave and convex lenses are used for the correction of short-sightedness and far-sightedness.
Cinemas were built in large numbers in big cities of the US in the 1910s.
This animation shows the characteristics of domestic light sources, from traditional light bulbs to LED lights.
A liquid-crystal display utilises the light modulating properties of liquid crystals.
This animation explains how a plasma display television works.
The diameter of the Sun is about 109 times that of the Earth. Most of its mass consists of hydrogen.