Loch Avon — Fotopedia
The very chilly Loch Avon.
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Cairngorms National Park

The Cairngorms National Park (Scottish Gaelic Pàirc Nàiseanta a' Mhonaidh Ruaidh) is a national park in north east Scotland, established in 2003. It was the second of two national parks established by the Scottish Parliament, after Loch Lomond and the Trossachs National Park, set up in 2002. The park covers the Cairngorms range of mountains, and surrounding hills. Already the largest national park in the British Isles, in 2010 it expanded into Highland and Perth and Kinross.

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Loch A'an

Loch A'an is an exceedingly remote freshwater loch set deep within the central Cairngorms plateau, in the Cairngorms National Park, located in the eastern Highlands of Scotland. Loch A'an, also called Loch Avon, is the source of the River Avon. Loch A'an is orientated southwest-northeast and is bounded on three sides by precipitous mountains, cliffs and crags, with the south east opening out to provide an outflow for the river through Glen Avon.

To the north of the loch, rising almost vertically, lies the Cairn Gorm, the sixth highest mountain in the United Kingdom. To the southwest of Cairn Gorm, at the head of the loch, lies the imposing peak of Ben Macdui, the second highest mountain in the UK, and to east lies Beinn Mheadhoin, the tenth highest mountain in the UK, again rising almost vertically from the Loch A'an basin. Lying less than 1 mile to the south of the loch and 664 ft (202 m) feet higher up the range at 3,041 ft (927 m), lies Loch Etchachan.

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Scottish Highlands

The Scottish Highlands, known locally simply as the Highlands (Scottish Gaelic: A' Ghàidhealtachd, "the place of the Gaels"; Scots: the Hielands) are a historic region of Scotland. The region became culturally distinguishable from the Lowlands from the later Middle Ages into the modern period, when Lowland Scots replaced Scottish Gaelic throughout most of the Lowlands. The term is also used for the area north and west of the Highland Boundary Fault, although the exact boundaries are not clearly defined, particularly to the east. The Great Glen divides the Grampian Mountains to the southeast from the Northwest Highlands. The Scottish Gaelic name of A' Ghàidhealtachd literally means "the place of the Gaels" and traditionally, from a Gaelic-speaking point of view, includes both the Western Isles and the Highlands.

The area is very sparsely populated, with many mountain ranges dominating the region, and includes the highest mountain in the British Isles, Ben Nevis. Before the 19th century the Highlands was home to a much larger population, but due to a combination of factors including the outlawing of the traditional Highland way of life following the Jacobite Rising of 1745, the infamous Highland Clearances, and mass migration to urban areas during the Industrial Revolution, the area is now one of the most sparsely populated in Europe. The average population density in the Highlands and Islands is lower than that of Sweden, Norway, Papua New Guinea and Argentina.

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Loch (/ˈlɒx/, also the non-standard but common /ˈlɒk/) is the Irish and Scottish Gaelic word for a lake and a sea inlet. In Hiberno-English, the anglicised spelling lough is commonly found in placenames, although it is pronounced the same way as loch. In Scottish English, 'loch' is always used. Some lochs could also be called firths, fiords, estuarys, straits or bays. Sea-inlet lochs are often called sea lochs or sea loughs. It is cognate with the Manx logh and the now obsolete Welsh word for lake, llwch.

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Specular reflection

Specular reflection is the mirror-like reflection of light (or of other kinds of wave) from a surface, in which light from a single incoming direction (a ray) is reflected into a single outgoing direction. Such behavior is described by the law of reflection, which states that the direction of incoming light (the incident ray), and the direction of outgoing light reflected (the reflected ray) make the same angle with respect to the surface normal, thus the angle of incidence equals the angle of reflection ( in the figure), and that the incident, normal, and reflected directions are coplanar. This behavior was first discovered through careful observation and measurement by Hero of Alexandria (AD c. 10–70).