Question

what does the cardboard denote in the poem a photograph? why has this word been used?

Answer 1

in the poem the photograph the word cardboard has been used to denote the photograph of narrator's mother with her two girl cousins. this word has been used because the photograph is pasted on a cardboard.
i hope this helps

Answer 2

Here is ur answer mate,

The word 'cardboard' denotes a snapshot or a photograph in the poem.This word has been used to portray the photographs of two girls and a smiling mother having a beautiful face like a natural scenery.

Hope it helps........