https://radiantdiscovery.co.uk/A closer look at the forces that make light visible.enhttps://radiantdiscovery.co.uk/why-a-white-surface-can-look-blue-in-the-shade/https://radiantdiscovery.co.uk/why-a-white-surface-can-look-blue-in-the-shade/Thu, 05 Nov 2026 09:50:00 +0000ColourWhy a white surface can look blue in the shade: see how cooler skylight changes its appearance and how to separate light colour from surface colour.https://radiantdiscovery.co.uk/plane-and-curved-mirrors-how-their-reflections-differ/https://radiantdiscovery.co.uk/plane-and-curved-mirrors-how-their-reflections-differ/Sun, 01 Nov 2026 07:30:00 +0000ReflectionPlane and curved mirrors shape reflected light differently. Learn how surface shape affects image size, orientation and field of view, and how to read each reflection.https://radiantdiscovery.co.uk/how-lenses-focus-light-in-a-camera-obscura/https://radiantdiscovery.co.uk/how-lenses-focus-light-in-a-camera-obscura/Fri, 30 Oct 2026 17:50:00 +0000LensesSee how lenses focus light in a camera obscura, brighten its projected scene and differ from a pinhole, with a safe setup you can adapt at home.https://radiantdiscovery.co.uk/why-a-shadow-edge-turns-soft/https://radiantdiscovery.co.uk/why-a-shadow-edge-turns-soft/Wed, 28 Oct 2026 14:10:00 +0000ShadowsUnderstand shadow-edge softness by reading the source and object positions, then choose a simple setup that makes the boundary easier to see.https://radiantdiscovery.co.uk/how-cloud-cover-changes-the-colours-you-see-through-a-window/https://radiantdiscovery.co.uk/how-cloud-cover-changes-the-colours-you-see-through-a-window/Mon, 26 Oct 2026 16:00:00 +0000Sky LightCloud cover changes the colours you see through a window. Learn to separate shifts in colour, brightness and contrast with a simple, useful observation.