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As per properties of real numbers with respect to addition, a + b ∈ R and ∀ a, b ∈ R is

As per properties of real numbers with respect to addition, a + b = b + a and ∀ a, b ∈ R is

As per properties of real numbers with respect to addition, (a + b) c + = a + (b + c) and ∀ a, b, c ∈ R is

As per properties of real numbers with respect to multiplication, ab = ba and ∀ a, b ∈ R is

As per properties of real numbers with respect to multiplication, ab ∈ R and ∀ a, b ∈ R is

As per properties of real numbers with respect to multiplication, (ab)c = a(bc) and ∀ a, b, c ∈ R is

The refractive index of glass with respect to water is 1.12. The refractive index of glass with respect to air is 1.5 What will be the refractive index of water with respect to air