In a Young's double-slit experiment, light of wavelength $\lambda$ passes through a double slit with separation $d$ and projects an interference pattern onto a screen at a distance $L$. The distance between consecutive bright fringes is $w$.

The experiment is modified as follows:

• The wavelength of the light is increased to $1.5\lambda$.
• The separation of the double slits is doubled to $2d$.
• The distance between the double slits and the screen is tripled to 3L.

What is the new fringe spacing in terms of the original spacing $w$?