Thickness of Lead to block photons

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h184.56cm=tan(1.95×.251.95)=>h1=2.1589cm

h284.56+d=tan(1.95+.251.95)=>h2=.042568d+3.599557

tanθ=h14.56cm=>25.6

tanθ=h24.56cm+d=>tan25.6=.042568d+3.599557d+4.56cm

the thickness of the lead = 3.24 cm