TECHNOLOGY FOCUS - CERAMICS AND GLASS - Preferred Composition: The reinforcing material is chosen from glass fiber, glass fiber cloth, glass cloth, glass nonwoven fabric and fiber glass mesh. The content of matrix and reinforcing material is 5-30 wt.% and 70-95 wt.%, respectively. The reinforcing material is woven in the warp and weft having a pattern. Preferred Properties: The composite sheet has hardening shrinkage rate of 6% or less as measured using the relation: hardening shrinkage rate=(surface roughness/(reinforcing material thicknessx 0.5))x 100x k, where the surface roughness is the difference of maximum height and minimum height measured along the thickness direction (in nm) of reinforcing material, and maximum diameter of pores in the reinforcing material is 10 mu m or more, when k is 1. The maximum diameter of pores in the reinforcing material is 10 mu m or less, when k is 2. The size of the pores is 200 mu m or less. The composite sheet has transmittance of 90% or more.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The composition comprises mixture of 50-90 pts. wt. bifunctional (meth)acrylate monomer or its oligomer and 10-50 pts. wt. trifunctional (meth)acrylate monomer or its oligomer. The polyfunctional (meth) acrylate monomer or its oligomer is non-urethane-type. The bifunctional (meth) acrylate monomer is chosen from ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, N-phenylglycine-glycidyl (meth)acrylate, pentaerythritol di(meth)acrylate, dipentaerythritol di(meth)acrylate, bisphenol A di(meth)acrylate and propylene glycol di(meth)acrylate. The trifunctional (meth) acrylate monomer is chosen from pentaerythritol tri(meth)acrylate, dipentaerythritol tri(meth)acrylate and trimethylolpropane tri(meth)acrylate. The composition further comprises tetrafunctional (meth)acrylate monomer or its oligomer, pentafunctional (meth)acrylate monomer or its oligomer and hexafunctional (meth)acrylate monomer or its oligomer.