Both meet the quality assurance requirement since they have the same PV indicator. However, one of the mirror only has one such error on its surface while the other has several. Now imagine that you have two mirrors, both with an error 1/4 lambda in wave front (a 1/8 lambda difference in the surface). Thus, the mirror meets the requirements for being of good quality. If a mirror is one with an error PV 1/4 lambda in wave front, it means that the difference between the highest and lowest point on the surface of the mirror is 1/8 lambda. So knowing this how much would be a permissible error and how can we tell if a mirror is of high quality? The best we can expect is that 84% of the light will fall in the central part of the disc and the remaining 16% will dissipate in the diffraction circles. This image is known as a “Airy disk” after astronomer George Airy. As a result, a star will appear as a bright central disk, surrounded by faint diffraction rings. Due to the wave nature of light, each image formed by an optical system suffers from diffraction. If it is possible to produce a mirror with zero spherical aberration, it is contrary to expectations and light rays would not be precisely focused at one point. Not all telescopes use parabolic mirrors, but whatever surface the mirror of the telescope is, it must be designed so as to eliminate spherical aberration or in the best case, to reduce it to acceptable limits. That is why parabolic mirrors are widely used in certain types of telescopes, for example “Newton” telescopes. If the spherical surface however, is parabolic, then all light rays which reach the mirror will focus in one common focus and produce a quality image. This phenomenon is known as “spherical aberration”. This unusual behavior is due to the fact that the light rays which reflect from the end zones of the spherical mirror are focused closer to the center, when compared to those which reflect off the center zones. Unlike radial rays, these parallel rays of light can not be focused by the spherical surface in one common focus. Tilt the platform so that the rounded rocks all roll north.As cosmic objects are at very large distances, the light rays coming from them reaches Earth parallel to each other, rather than radial, as it happens with earthly objects. The total load is the sum of the load caused by all of the rounded rocks. (Cube-shaped rocks ( #) don't contribute to load.) So, the amount of load caused by each rock in each row is as follows: OOOO.#.O. The amount of load caused by a single rounded rock ( O) is equal to the number of rows from the rock to the south edge of the platform, including the row the rock is on. You notice that the support beams along the north side of the platform are damaged to ensure the platform doesn't collapse, you should calculate the total load on the north support beams. Start by tilting the lever so all of the rocks will slide north as far as they will go: OOOO.#.O. You note the positions of all of the empty spaces (. The platform even has a control panel on the side that lets you tilt it in one of four directions! The rounded rocks ( O) will roll when the platform is tilted, while the cube-shaped rocks ( #) will stay in place. In short: if you move the rocks, you can focus the dish. Depending on their position, the weight of the rocks deforms the platform, and the shape of the platform controls which ropes move and ultimately the focus of the dish. The platform is covered in large rocks of various shapes. Upon closer inspection, the individual mirrors each appear to be connected via an elaborate system of ropes and pulleys to a large metal platform below the dish. This system must be what provides the energy for the lava! If you focus the reflector dish, maybe you can go where it's pointing and use the light to fix the lava production. If the dish is meant to focus light, all it's doing right now is sending it in a vague direction. The dish is made up of many small mirrors, but while the mirrors themselves are roughly in the shape of a parabolic reflector dish, each individual mirror seems to be pointing in slightly the wrong direction. You reach the place where all of the mirrors were pointing: a massive parabolic reflector dish attached to the side of another large mountain. Tretton37 - HAPPY HOLIDAYS AoC lovers - stay 1337 & sleigh those challenges! - Day 14: Parabolic Reflector Dish.
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