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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §2.3 The Slope and the Tangent Line, #26 · Calculus · Derivatives

In a bad reflector …, a ray down one special line …

In a bad reflector $y = 2/ x$ , a ray down one special line $x = a$ is reflected horizontally. What is $a$ ?

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §2.3 The Slope and the Tangent Line, #26

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