Final answer:
The ratio of the lengths 4x10^-6 to 0.000002, when expressed in the same format, is 2 to 1.
Step-by-step explanation:
The student is asking for the ratio of two lengths given in different formats: one is in scientific notation (4x10-6) and the other is in decimal form (0.000002).
To calculate this ratio, we need to express both numbers in the same format. Since 0.000002 can be written as 2x10-6, the ratio of the two lengths is 4x10-6 to 2x10-6 which simplifies to 2 to 1.