Does light bends when it comes in contact with magnet?
Path of light is unaffected by presence of external magnetic field.
What is difference between wave front and wavelet?
Wave front is the locus of all the vibrating particle in the same phase. for example, an almond is dropped in a bucket full of milk, you can notice the circular wavefront generating on the surface of milk.
Wavelet is simply an oscillation that increases from zero reach to maximum and maximum to zero.