This paper presents a detailed review of the applications of augmented reality (AR) in three important fields where AR use is currently increasing. The objective of this study is to highlight how AR improves and enhances the user experience in entertainment, medicine, and retail. The authors briefly introduce the topic of AR and discuss its differences from virtual reality. They also explain the software and hardware technologies required for implementing an AR system and the different types of displays required for enhancing the user experience. The growth of AR in markets is also briefly discussed. In the three sections of the paper, the applications of AR are discussed. The use of AR in multiplayer gaming, computer games, broadcasting, and multimedia videos, as an aspect of entertainment and gaming is highlighted. AR in medicine involves the use of AR in medical healing, medical training, medical teaching, surgery, and post-medical treatment. AR in retail was discussed in terms of its uses in advertisement, marketing, fashion retail, and online shopping. The authors concluded the paper by detailing the future use of AR and its advantages and disadvantages in the current scenario.

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An efficient and convenient approach for the synthesis of tetrahydrobenzo[b]pyran derivatives under mild condition using the task specific ionic liquid 1,8-diazabicyclo[5.4.0]-undec-7-en-8-ium acetate ([DBU][Ac])as an efficient catalyst is described. A wide range of aromatic aldehydes easily undergo condensation with malononitrile and 5,5-dimethylcyclohexane-1,3-dione (dimedone) to afford the desired products in excellent yields. Taking into account the environmental and economical considerations, the present protocol has the merits of environmentally benign procedure such as shorter reaction time, low cost, recycling of the catalyst and simple workup.