Blue is the colour between violet and green on the optical spectrum of visible light. Human eyes perceive blue when observing light with a wavelength between 450 and 495 nanometres.
The United Kingdom is a Sovereign island country. It consists of 4 constituent countries, England, Northern Ireland, Scotland and Wales. Great Britain is the name of the island which consists of England, Scotland and Wales.The full name is the United Kingdom of Great Britain and Northern Ireland. The UK is part of the continent of Europe.he United Kingdom is a Sovereign island country. It consists of 4 constituent countries, England, Northern Ireland, Scotland and Wales. Great Britain is the name of the island which consists of England, Scotland and Wales.
The official name of the UK is the  United Kingdom of Great Britain and Northern Ireland . What countries make up the UK? The name refers to the union of what were once four separate nations: England, Scotland, Wales and Ireland (though most of Ireland is now independent.Only Northern Ireland is part of the UK now).he official name of the UK is the  United Kingdom of Great Britain and Northern Ireland . What countries make up the UK? The name refers to the union of what were once four separate nations: England, Scotland, Wales and Ireland (though most of Ireland is now independent.