Light can pass through a lens because lenses are either transparent or translucent (i.e. sunglasses).
Because the lens is curved.
it refracts, transmited, absorbed, reflected. I'm not the smartest person but i think its absorbing. good luck
The photons are absorbed by electrons that they encounter, then re-radiated onward. If the convex lens is in a medium of lower refractive index, the light converges on its way through, and emerges...
IF you meant a convex lens - light entering the lens is bent because it's passing from one medium to another - to converge at the focal point.