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For the opposite surface, the ratio R₂/R₁ equals 1.5, with R₂ being 3.0 cm. Calculate the total thickness of the slab, given by R₁ + R₂.

1. Total thickness of the slab = R₁ + R₂ = 7.5 + 3.0 = 10.5 cm.
2. Total thickness of the slab = R₁ + R₂ = 7.5 + 3.0 = 11.5 cm.
3. Total thickness of the slab = R₁ + R₂ = 7.5 + 3.0 = 12.5 cm.
4. Total thickness of the slab = R₁ + R₂ = 7.5 + 3.0 = 13.5 cm.

Correct answer: Total thickness of the slab = R₁ + R₂ = 7.5 + 3.0 = 10.5 cm.

Solution

The thickness of the slab is calculated as the sum of R₁ and R₂, which is 7.5 cm + 3.0 cm = 10.5 cm. This matches option A.

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