Two mayor slits are 0.025 mm. apart. when the laser shines on them, right fringes form on teh screen that is a meter away. these fringes are 3.0 cm apart what is the separation between the second order fringe and the central fringe?

This is a problem in which you have to make a comparison about the two spaces given between the points. In the case of the central strip we know that it is of order 2. Therefore, if the strip width is 3 cm, the distance that will exist towards the bright strip of the second order will be the first strip, plus an equidistant 3 cm, that is, a strip of 6cm from the first to the last strip.

The correct answer is B.

1/0.14nm = 10^10/1.4 a lot

conduction, convection, radiation