Questions

Optical fiber works on the principle of total internal reflection.

The Total Internal Reflection is the phenomenon in which the complete reflection of a light ray reaching an interface with a less dense medium when the angle of incidence exceeds the critical angle.

The Ezra Cup is a popular polo tournament conducted annually in India. The Calcutta Polo Club runs this oldest and first ever Polo Trophy. The first Ezra Cup was held in 1880. After a period of inactivity, it has now been revived by Mr. Keshav Bangur, Calcutta Polo Club's president.

Ginans are devotional hymns or poems recited by Shia Ismaili Muslims.Although ginanscan be recited, studied, and listened to by non-Nizari Ismailis, ginans hold a special role in the cultural practice and rituals of Nizari Ismailis, specifically the community of Khojas, a caste of south asians of whom the majority now identify as Nizari Ismaili.

According to al-Biruni, the sufi theories of the soul were similar to those in Patanjali’s Yoga Sutra. Like the Yoga Sutra, sufi works also stated that ‘the bodies are the snares of the souls for the purpose of acquiring recompense’. Al-Biruni also identifies the sufi doctrine of divine love as self-annihilation with parallel passages from the Bhagavad Gita. There was also much exchange of ideas between the Sufis and Indian yogis. In fact the hatha-yoga treatise Amrita Kunda was translated into Arabic and Persian, So C is right.

Hujwiri was known as Datta Ganj Baksh. Hujwiri comments that before he settled in Lahore some sufis believed in theories that he calls brahmanical. According to Hujwiri they wrongly believed that ‘annihilation (fand’) signifies loss of essence and destruction of the personality, and that subsistence (baqa) indicates the subsistence of God in man.