Taj Mahal, Agra ताज महल

Uttar Pradesh /ˌʌtər prəˈdɛʃ/, abbreviation U.P. ("Northern Province"; formerly: United Provinces), is a state located in the northern part of India. With a population of over 200 million people, it is India's most populous state, as well as the world's most populous sub-national entity. Were it a nation in its own right, Uttar Pradesh would be the world's fifth most populous country, ahead of Brazil (a country thirty-five times larger in territorial area than Uttar Pradesh). On 9 November 2000, the Himalayan portion of the state, comprising the Garhwal and Kumaon divisions and Haridwar district, was formed into a new state 'Uttaranchal', now called Uttarakhand, meaning the 'Northern Segment' state.

The Yamuna (Hindi/Sanskrit: यमुना, Urdu:جمنا sometimes called Jamuna (Bengali:যমুনা Jomuna) (Hindi: जमुना) or Jumna) is the largest tributary river of the Ganges (Ganga) in northern India. Originating from the Yamunotri Glacier at a height 6,387 metres, on the south western slopes of Banderpooch peaks, in the Lower Himalayas in Uttarakhand, it travels a total length of 1,376 kilometers (855 mi) and has a drainage system of 366,223 km², 40.2% of the entire Ganges Basin, before merging with the Ganges at Triveni Sangam, Allahabad, the site for the Kumbha Mela every twelve years.

It crosses several states, Uttarakhand, Haryana and Uttar Pradesh, passing by Himachal Pradesh and later Delhi, and meets several of its tributaries on the way, including Tons, its largest and longest tributary, Chambal, which has its own large basin, followed by Sindh, the Betwa, and Ken. Most importantly it creates the highly fertile alluvial, Yamuna-Ganges Doab region between itself and the Ganges in the Indo-Gangetic plain. Nearly 57 million people depend on the Yamuna waters. With an annual flow of about 10,000 cubic billion metres (cbm) and usage of 4,400 cbm (of which irrigation constitutes 96 per cent), the river accounts for more than 70 per cent of Delhi’s water supplies. Just like the Ganges, the Yamuna too is highly venerated in Hinduism and worshipped as goddess Yamuna, throughout its course. In Hindu mythology, she is the daughter of Sun God, Surya, and sister of Yama, the God of Death, hence also known as Yami and according to popular legends, bathing in its sacred waters frees one from the torments of death.

The Taj Mahal ( /ˈtɑːdʒ/ or /ˈtɑːʒ məˈhɑːl/; Hindi: ताज महल, from Persian/Urdu: تاج محل "crown of palaces", pronounced [ˈt̪aːdʒ mɛˈɦɛl]; also "the Taj") is a white marble mausoleum located in Agra, India. It was built by Mughal emperor Shah Jahan in memory of his third wife, Mumtaz Mahal. The Taj Mahal is widely recognized as "the jewel of Muslim art in India and one of the universally admired masterpieces of the world's heritage."

India (ⁱ/ˈɪndiə/), officially the Republic of India (Bhārat Gaṇarājya), is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world. Bounded by the Indian Ocean on the south, the Arabian Sea on the south-west, and the Bay of Bengal on the south-east, it shares land borders with Pakistan to the west; China, Nepal, and Bhutan to the north-east; and Burma and Bangladesh to the east. In the Indian Ocean, India is in the vicinity of Sri Lanka and the Maldives; in addition, India's Andaman and Nicobar Islands share a maritime border with Thailand and Indonesia.

Agra (English pronunciation: /ˈɑːɡrə/; Hindi: आगरा, Urdu: آ گرہ), the erstwhile capital of Hindustan, is a city on the banks of the river Yamuna in the northern state of Uttar Pradesh, India, 363 kilometres (226 mi) west of state capital, Lucknow and 200 kilometres (124 mi) south from national capital New Delhi. With a population of 1,686,976 (2010 est.), it is one of the most populous cities in Uttar Pradesh and the 19th most populous in India. Because 80 percent of the city's sewage flows into Yamuna River, it is 20th most polluted city in India. Agra can also refer to the administrative district that has its headquarters in Agra city.

The city finds mention in the epic Mahābhārata where it was called Agrevaṇa, or 'the border of the forest'. Legend ascribes the founding of the city to Rājā Badal Singh, a Sikarwar Rajput king (circa 1475), whose fort, Badalgarh, stood on or near the site of the present Fort. However, the 11th century Persian poet Mas'ūd Sa'd Salmān writes of a desperate assault on the fortress of Agra, then held by the Shāhī King Jayapala, by Sultan Mahmud of Ghazni. Sultan Sikandar Lodī was the first to move his capital from Delhi to Agra in the year 1506; he died in 1517 and his son Ibrāhīm Lodī remained in power there for nine more years, finally being defeated at the Battle of Panipat in 1526. It achieved fame as the capital of the Mughal emperors from 1526 to 1658 and remains a major tourist destination because of its many splendid Mughal-era buildings, most notably the Tāj Mahal, Agra Fort and Fatehpūr Sikrī, all three of which are UNESCO World Heritage Sites.

A mirror image is a reflected duplication of an object that appears identical but reversed. As an optical effect it results from reflection off of substances such as a mirror or water. It is also a concept in geometry and can be used as a conceptualization process for 3-D structures. In chemistry, a '"mirror image'" is a molecule having a spatial arrangement that corresponds to that of another molecule except that the right-to-left sense on one corresponds to the left-to-right sense on the other, the left handedness being known as "levo" or l-x and the righthandedness being known as "dextro" or d-x, where "x" is the referenced molecule.

The Indian subcontinent is a region of Asia situated mostly on the Indian tectonic plate.

A UNESCO World Heritage Site is a place (such as a forest, mountain, lake, desert, monument, building, complex, or city) that is listed by the UNESCO as of special cultural or physical significance. The list is maintained by the international World Heritage Programme administered by the UNESCO World Heritage Committee, composed of 21 states parties which are elected by their General Assembly.

The program catalogues, names, and conserves sites of outstanding cultural or natural importance to the common heritage of humanity. Under certain conditions, listed sites can obtain funds from the World Heritage Fund. The programme was founded with the Convention Concerning the Protection of World Cultural and Natural Heritage, which was adopted by the General Conference of UNESCO on November 16, 1972. Since then, 189 states parties have ratified the convention.

As of 2011^[update], 936 sites are listed: 725 cultural, 183 natural, and 28 mixed properties, in 153 States Parties. Italy is home to the greatest number of World Heritage Sites to date with 47 sites inscribed on the list. UNESCO references each World Heritage Site with an identification number; but new inscriptions often include previous sites now listed as part of larger descriptions. As a result, the identification numbers exceed 1200 even though there are fewer on the list.

The World Heritage Sites in India recognized by the United Nations Educational, Scientific and Cultural Organization (UNESCO) are 28, as of 2010. These are places of importance of cultural or natural heritage as described in the UNESCO World Heritage Convention, established in 1972. The Convention concerning the protection of the World Cultural and Natural Heritage was adopted on 17 November 1997 following the General Conference of the UNESCO held from 17 October 1972 to 21 November 1972. The Convention is defined under 28 Articles. Broadly, the Cultural Heritage Sites are defined in Article 1 as monuments, groups of buildings and sites, while the natural sites defined under Article 2 refer to natural features, geological and physiographical formations and natural sites. As of date, there are 911 properties under the World Heritage List, which cover 711 cultural sites, 180 natural sites and 27 mixed properties encompassing 152 countries, including India. Countries who have signed the Convention are 187 States, including India, which signed the Convention on November 14, 1977.

India’s first two sites inscribed on the list at the Seventh Session of the World Heritage held in 1983 were the Agra Fort and the Ajanta Caves. Over the years, 26 more sites have been inscribed, the latest site inscribed in 2010 being the Jantar Mantar, Jaipur. Of these 28 sites, 23 are cultural sites and the other five are natural sites. A tentative list of further sites/properties submitted by India for recognition includes 30 sites.

Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound and water waves. The law of reflection says that for specular reflection the angle at which the wave is incident on the surface equals the angle at which it is reflected. Mirrors exhibit specular reflection.

In acoustics, reflection causes echoes and is used in sonar. In geology, it is important in the study of seismic waves. Reflection is observed with surface waves in bodies of water. Reflection is observed with many types of electromagnetic wave, besides visible light. Reflection of VHF and higher frequencies is important for radio transmission and for radar. Even hard X-rays and gamma rays can be reflected at shallow angles with special "grazing" mirrors.