Questions asked by Neh Pandya

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The focal length of a mirror is given by $\frac{1}{f} = \frac{1}{u} + \frac{1}{v}$ $1/f=1/u+1/v$ where u and v represent object and image distances respectively,The maximum relative error in f is ?
If $α, β$ $alpha, beta$ are the roots of $x^{2} + p x + q = 0$ $x^2+px+q=0$ and also of $x^{2 n} + p^{n} x^{n} + q^{n}$ $x^(2n) + p^nx^n + q^n$ = 0 and if $\frac{α}{β}, \frac{β}{α}$ $alpha/beta, beta/alpha$ are the roots of $x^{n} + 1 + {(x + 1)}^{n} = 0,$ $x^n + 1 + (x+1)^n = 0 ,$ then prove that n must be an even integer?