Don Ihde called the hypothesis being 'hyped' and referred to clear evidence about the use of optical tools by, ., Albrecht Dürer and Leonardo da Vinci and others. As well the 1929 Encyclopædia Britannica  contains an extensive article on the camera obscura and cites Leon Battista Alberti as the first documented user of the device as early as 1437.  Ihde states abundant evidence for widespread use of various technical devices at least in the Renaissance and . in Early Netherlandish painting .  Jan van Eyck 's 1434 painting Arnolfini Portrait shows a convex mirror in the centre of the painting. Van Eyck also left his signature above this mirror,  showing the importance of the tool. The painting includes a crown glass window in the upper left side, a rather expensive luxury at the time. Van Eyck was rather fascinated by glass and its qualities, which was as well of high symbolic importance for his contemporaries.  Early optical instruments were comparatively expensive in the Medieval age and the Renaissance. 
When writing a term paper, the one thing you’ve got to remember is to use authoritative sources. These are vital if the paper is to persuade the intended audience. Reliable sources can be found everywhere from the library down the street to the internet. Internet sources must be used cautiously, since some sites are just run by wackos; nonetheless, some sites do provide quality information. Once the writer has found her sources, she must remember to cite them properly in order to avoid plagiarism. Plagiarism is bad. Citation styles vary across the disciplines, but they can usually be figured out with a proper style manual.
13 Boaz took Ruth. When they came together as husband and wife, the L ORD enabled her to conceive and she bore a son. 14 Then the women said to Naomi, “Blessed is the L ORD who has not failed to provide you today with a redeemer. May he become famous in Israel! 15 He will restore your life and be the support of your old age, for his mother is the daughter-in-law who loves you. She is worth more to you than seven sons!” 16 Naomi took the boy, cradled him * against her breast, and cared for him. 17 The neighbor women joined the celebration: “A son has been born to Naomi!” f They named him Obed. He was the father of Jesse, the father of David.