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x² =√26² - 10²
x = √676 - 100
x = √576 = 24 cm
Lp = 2La + (Ka. t prisma)
960 = 2 1/2. 24 . 10 + ( (26 + 10 + 24) × t)
960 = 240 + 60t
60t = 720
t = 12 cm