Question

Explain Infinity with Example.

Answer 1

Infinity is the largest real number greater than any other real number.

Since we cannot express its value as a number, we denote it by ∞.

see 10^30, 10^100,     10^(10^(10^10)) numbers increase 
  as  x becomes smaller and smaller  1/x   approaches infinity.

like  1/10^-100,     1/0.1^(10^10(10^10))  
like this we increase the power of 0.1 then denominator decreases. Then the value of fraction approaches infinity.

1/f = 1/ u + 1/v

if image is formed for a concave mirror at focus, then v = f.

then  1/f = 1/u + 1/f
      =>  1/u = 0   then    u = ∞