Real-World Applicationshard
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The ray transfer matrix (ABCD matrix) for a thin lens of focal length ff is M_{lens} = \\begin{pmatrix} 1 & 0 \\ -1/f & 1 \\end{pmatrix}, and for a free space drift of distance dd is M_{drift} = \\begin{pmatrix} 1 & d \\ 0 & 1 \\end{pmatrix}. An optical system consists of a thin lens of focal length f=10f = 10 cm, followed by a drift of distance d=20d = 20 cm, followed by another thin lens of focal length f=10f = 10 cm. What is the element AA (top-left entry) of the system's overall ABCD matrix?