Tennyson contribution to elegy

Elegy is a sad poem, usually written to commemorate an individual's death. The term comes from the Greek elegia, which means "to lament". Typically, one hear elegies at funerals; an obituary is the prose equivalent. Elegies are also shorter. As poet Laureate for more than forty years, Tennyson was frequently asked by Queen Victoria and others to write celebratory verse. His most significant artistic work dealing with this subject is contained in the central lyrics chiefly rest on his great elegy 'In Memoriam'.
'In Memoriam' is a long poem. It was written in memory of the poet's dead friend Arthur Halam. In this poem, grief and love are expressed with an economy of words and deep intensity of feeling.
Tennyson's 'Break Break Break' is an elegy, which is a lyrical poem of lamentation. It does not tell a narrative story like Browning's short narrative poem "My Last Duchess". It is written in four quatrain stanzas (four lines, four stanzas).

" But the tender grace of a day that is dead." 

Line descriptively refer to his deceased friend and well wisher, poet Arthur Hallam.
In Tennyson's another poem "Tears, Idle Tears", repetition of the word 'tears' emphasizes Tennyson's uncountable sadness and makes us 'feel' that they are involuntary. In this poem the line is:

 " Tears from the depth of some divine despair."

Through this line Tennyson wanted to describe that the tears were of God's weeping for the inevitable loss of all that mortal life means.
Thus Tennyson is a careful observer of the nature and is equally depth at portraying psychological states of his characters.