A cantilever beam of rectangular cross-section is subjected to a load 'W' at its free end, causing deflection δ1. If the load is increased to '2W' causing deflection δ2, the ratio of value of \(\left( {\frac{{{{\rm{\delta }}_1}}}{{{{\rm{\delta }}_2}}}} \right)\) will be
1
0.5
2
1.0
3
2.0
4
4.0