Answer:

1)The camera has captured a happy moment from the childhood days of the poet's mother. The photograph was taken when the poet's mother (at the age of twelve or so) went to a beach holiday with two of her cousins, Betty and Dolly. The captured PICTURE serves as a preserved memory both for the mother as well as the poet.

2)Ans. The phrase “strange to tell” means that it is quite strange for the poet to believe and express in words that the soft-falling rain replied to his question. At the beginning of the poem, the poet inquires the rain about its identity, to which the rain replies that it is the 'Poem of Earth'.

3)The poet, basically, seems to be obsessed about his childhood and, more so, about its loss. He feels very nostalgic and lament over the fact that his childhood will never COME back.

4)According to me, the most poetic lines are Where did may childhood GO? It went to some forgotten place. That's hidden in an infant's place. ... We all know that our pure and unadulterated childhood will never come back to US, though we know that it REMAINS hidden o" an infant's face.

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I hope it helps ..