Answer:
The effect of this refrain is to show the deep love he feels for his beloved one.
Explanation:
These lines emphasize the desire of the man to demonstrate his love through words. It is not just an example of visual repetition in the syllables but also a phonetic repetition, the "na" sound repeated at the end of the words Khanjana, Anjana, and Ranjana produce a recurring assonance sound, which shows how important is this woman in his life and how they're deeply connected.