Theory:

     She picked up the white woollen pullover, wrapped herself in a shawl and made her way to the roof, to break up his tete-a-tete with Dibya.
 
     She found them both huddled together eye to eye. At least Duttada was looking into Dibya’s eyes.
 
     When Duttada acquired this telescope he was so thrilled that he called it Dibya Chakshu — Divine Eye. To Indrani Debi the telescope was like a designing woman who had ensnared her husband. So she just called it Dibya and the name stuck.
Explanation:
 
Indrani was upset with her husband, Duttada, as he spent more time with Dibya than with her. She wrapped herself in a shawl, which was important in the cold weather, and ascended the stairs to the rooftop, looking to find her husband and disturb their (Duttada and Dibya's) private meeting. As Indrani ascended the stairs, she found Dibya and Duttada gathered together, eye to eye, and Duttada was staring into Dibya's eyes. Who was Dibya? Though the author refers to 'Dibya' as 'she,' Dibya is actually an object and not a woman.
 
Duttada with his telescope.jpg
Duttada with his telescope
 
As Indrani predicted earlier, Duttada was working with his telescope, "Dibya". Dibya was an eight-inch telescope that acted as Duttada's soulmate. When Duttada got the telescope (Dibya), he was so thrilled that he named it 'Dibya Chakshu,' which means 'Divine eye,' since it would allow him to see heavenly bodies that the human eye could not see. Duttada believed that Dibya would help him achieve his aim. It was the other way around with his wife, Indrani Debi. The telescope (Dibya) looked to Indrani as a designing woman, trapped Duttada to achieve his ambition without thinking about anything else. So, she just called it 'Dibya'.
 
Meaning of difficult words:
  
S.No
Word
Meaning
1.
Ensnared
Having complete control over someone or something
2.
Wrapped
To cover something with
3.
Huddled
To get close to other people
4.
Tete-a-teteA private conversation between two people
Reference:
National Council of Educational Research and Training (2008). The Comet I - Jayant Narlikar (pp. 73-80). Published at the Publication Division by the Secretary, National Council of Educational Research and Training, Sri Aurobindo Marg, New Delhi.