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Level: Terminale Specialty Physics Chemistry This video presents an exercise on images and the astronomical telescope. Remember that with I have 20 in maths there are never any problems, only solutions. Find all my videos and CORRECTED exercises on https://www.jai20enmaths.com/ To follow us: INSTAGRAM ► / jai20enmaths FACEBOOK ► / jai20enmaths TWITTER ► / jai20enmaths 00:00 Construction and modeling of the telescope. 02:42 Adjustment and length of the telescope. 07:30 Graphic construction of light rays. 15:59 Apparent diameter. Approximation of small angles. 19:13 Magnification of an afocal astronomical telescope.