{"id":40,"date":"2014-10-15T17:53:58","date_gmt":"2014-10-15T17:53:58","guid":{"rendered":"http:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecscis1revision\/light-radiation-revision\/"},"modified":"2014-10-23T09:04:26","modified_gmt":"2014-10-23T09:04:26","slug":"light-radiation-revision","status":"publish","type":"page","link":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecscis1revision\/light-radiation-revision\/","title":{"rendered":"Light & Radiation Revision"},"content":{"rendered":"

Light and Radiation Summary<\/span><\/strong>\u00a0<\/p>\n

Light is a form of energy and it always travels in straight lines.\u00a0<\/p>\n

\"\"<\/a>When light is shone onto a reflective surface at an angle, it will reflect off it at the same angle.\u00a0<\/p>\n

\u00a0Angle of incidence = Angle of reflection.<\/strong>\u00a0<\/p>\n

\u00a0<\/strong>\u00a0<\/p>\n

The angle of incidence is measured between the incident ray and the normal.\u00a0\u00a0 The angle of reflection is measured between the reflected ray and the normal\u00a0<\/p>\n

\u00a0<\/strong>\u00a0<\/p>\n

\u00a0<\/strong>\u00a0<\/p>\n

Refraction<\/span><\/strong>\u00a0<\/p>\n

When light travels from one material to another (e.g air into glass), the light can change direction. This change of direction is known as refraction. <\/strong>The angle of refraction inside the glass will be smaller<\/strong> than the angle of incidence in air.\u00a0\u00a0 We say that the light bends towards the Normal.\u00a0<\/p>\n

\"\"<\/a>\u00a0<\/p>\n

\u00a0<\/strong><\/p>\n

Prisms<\/span><\/strong><\/p>\n

\"\"<\/a><\/p>\n

When white light is passed through a prism; it produces a spectrum.\u00a0<\/p>\n

The spectrum is a continuous spread of colours and is the same spread of colours you see in a rainbow.<\/p>\n

The mnemonic\u00a0\u00a0 \u00a0R<\/strong>ichard O<\/strong>f Y<\/strong>ork G<\/strong>ave B<\/strong>attle I<\/strong>n V<\/strong>ain\u00a0\u00a0 can be used to remember the order of the colours\u00a0\u00a0 R<\/strong>ed, O<\/strong>range, Y<\/strong>ellow, G<\/strong>reen, B<\/strong>lue, I<\/strong>ndigo, V<\/strong>iolet.<\/p>\n

Coloured Filters<\/span><\/strong><\/p>\n

Filters can be used to produce different colours of light when white light is passed through it. They work by allowing the colour of light appropriate to the filter through but absorb all the other colours that make up white light. For example, a green filter allows green light through but absorbs red, orange, yellow, blue, indigo and violet.<\/p>\n

Red, green and blue filters can be used with white light in colour mixing to produce other colours.<\/p>\n

Red + Green \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 = Yellow<\/strong><\/p>\n

Red + Blue\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 = Magenta<\/strong><\/p>\n

Blue + Green \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 = Cyan<\/strong><\/p>\n

Red + Green + Blue = White<\/strong><\/p>\n

\u00a0<\/strong><\/p>\n

Shining Light onto Coloured Surfaces<\/span><\/strong><\/p>\n

\u00a0<\/span><\/strong><\/p>\n

The colour seen by the human eye depends on two <\/strong>factors: The colour of light shining and <\/strong>the colour of object the light is shining on.<\/p>\n

A green car appears green in white light because it reflects green light and absorbs red and blue.<\/p>\n

\"\"<\/a><\/p>\n

Lenses<\/span><\/strong><\/p>\n

Convex<\/strong> lenses (surface curves \u2018out\u2019) make rays of light converge (come together)<\/p>\n

\"\"<\/a><\/p>\n

Concave<\/strong> lenses (surface curves \u2018in\u2019) make rays of light diverge (move apart)<\/p>\n

\"\"<\/a><\/a><\/p>\n

The Electromagnetic (e-m) Spectrum<\/h1>\n

\u00a0<\/p>\n

The e-m spectrum is a \u201cfamily\u201d of waves all travelling at the speed of light (3×108<\/sup> m\/s).\u00a0 These radiations have different wavelengths and frequencies.<\/p>\n

\"\"<\/a><\/p>\n

The different radiations have unique properties and can be used in different ways:<\/p>\n

\"\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Light and Radiation Summary\u00a0 Light is a form of energy and it always travels in straight lines.\u00a0 When light is shone onto a reflective surface at an angle, it will reflect off it at the same angle.\u00a0 \u00a0Angle of incidence = Angle of reflection.\u00a0 \u00a0\u00a0 The angle of incidence is measured between the incident ray … Continue reading “Light & Radiation Revision”<\/span><\/a><\/p>\n","protected":false},"author":2454,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-40","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecscis1revision\/wp-json\/wp\/v2\/pages\/40","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecscis1revision\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecscis1revision\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecscis1revision\/wp-json\/wp\/v2\/users\/2454"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecscis1revision\/wp-json\/wp\/v2\/comments?post=40"}],"version-history":[{"count":20,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecscis1revision\/wp-json\/wp\/v2\/pages\/40\/revisions"}],"predecessor-version":[{"id":44,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecscis1revision\/wp-json\/wp\/v2\/pages\/40\/revisions\/44"}],"wp:attachment":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecscis1revision\/wp-json\/wp\/v2\/media?parent=40"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}