Why oil is used in 100 X objective lens?

[@krishnamoni220]

If a person has any attention to learn something, can ba a student in any age. Salute to you sir

[@pathogenesis_mb]

Thank you. 🙏

[@zeraitarrekegn7312]

Very good😮

[@ahsanhabibjihad786]

Tnq sir

[@user-fu3ut1vo3y]

Thank you for short explanation

[@oyashimakram1138]

Thank you sir .........

[@cutekurii6247]

Appreciated ❤

[@HRIDOYOR_JUNAK]

Thank you Sir❤️

[@travelholic9143]

Thank you sir💜

[@luitporiyadeka3420]

👍

[@ProfSayan]

👏👍

[@pathogenesis_mb]

🙏

[@subhadipkhatua6298]

Thank you sir ☺️