![]() ![]() Suppose that a light bulb is placed in front of a concave mirror at a location somewhere behind the center of curvature (C). Only in the case of a real image, light is actually passing through the image location. When a real image is formed, it still appears to an observer as though light is diverging from the real image location. In this lesson we will begin to see that concave mirrors are capable of producing real images (as well as virtual images). Light does not actually pass through the virtual image location it only appears to an observer as though the light is emanating from the virtual image location. For plane mirrors, virtual images are formed. In Lesson 2, it was emphasized the image location is the location where reflected light appears to diverge from. Lesson 2 discussed the formation of images by plane mirrors. This process is illustrated with two separate incident rays in the diagram at the right. Once the normal is drawn the angle of incidence can be measured and the reflected ray can be drawn with the same angle. ![]() ![]() For a concave mirror, the normal at the point of incidence on the mirror surface is a line that extends through the center of curvature. The task of determining the direction in which an incident light ray would reflect involves determining the normal to the surface at the point of incidence. He is also the host of CATHOLICISM, a groundbreaking, award-winning documentary about the Catholic Faith, which aired on PBS.īishop Barron is a #1 Amazon bestselling author and has published numerous books, essays, and articles on theology and the spiritual life. He is a religion correspondent for NBC and has also appeared on FOX News, CNN, and EWTN.īishop Barron’s website,, reaches millions of people each year, and he is one of the most-followed Catholics on social media. His regular YouTube videos have been viewed over 90 million times.īishop Barron’s pioneering work in evangelizing through the new media led Francis Cardinal George to describe him as “one of the Church’s best messengers.” He has keynoted many conferences and events all over the world, including the 2016 World Youth Day in Kraków, Poland, as well as the 2015 World Meeting of Families in Philadelphia, which marked Pope Francis’ historic visit to the United States.Light always follows the law of reflection, whether the reflection occurs off a curved surface or off a flat surface. In point of fact, Jesus is suggesting a much more aggressive image: his Church will lay successful siege upon the kingdom of evil, knocking down its gate and breaching its walls.Īnd notice, too, how Jesus uses the future tense-“I will build my Church.” Therefore he cannot be speaking simply of Peter personally but of all those who would participate in his charism throughout the centuries.The integrity of this ekklesia will be guaranteed up and down the centuries-not through appeal to popular opinion (as instructive as that might be) nor through the ministrations of an institutional or theological elite (as necessary as those might be) but rather through the pope’s charismatic knowledge of who Jesus is.īishop Robert Barron is the founder of Word on Fire Catholic Ministries and bishop of the Diocese of Winona-Rochester in Minnesota. It is fascinating to me how often we construe this saying of Jesus in precisely the opposite direction, as though the Church is guaranteed safety against the onslaughts of hell. And Jesus insists that this society, grounded in Peter’s confession, would constitute an army so powerful that not even the fortified capital of the dark kingdom itself could withstand it. Friends, in today’s Gospel, Jesus declares that the gates of hell (“the netherworld”) shall not prevail against his Church. ![]()
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