摘要:
A fiber-reinforced composite material comprising fibers of 4 to 200 nm average diameter and a matrix material, whose light transmittance at a wavelength of 400 to 700 nm in terms of 50 μm thickness is 60% or higher. There is also provided a fiber-reinforced composite material comprising a fiber assembly and a matrix material having penetrated the fiber assembly, wherein providing that L represents the segment length in light place region, the light place region corresponding to pore region of the fiber assembly, obtained by statistic analysis of one-way run length images prepared from binarized images obtained by binarization of scanning electron micrograph images of the fiber assembly, the total length of L ≥ 4.5 μm segments is 30% or less of the total analyzed length. There are further provided, including a transparent substrate comprised of the fiber-reinforced composite material, a transparent laminate, wiring board and light guide.