What actors and actresses appeared in Kaagaz Ki Nao - 1975?

You're likely thinking of the 1973 film "Kagaaz Ki Nao" (translated as "Paper Boat") starring:

* Sanjeev Kumar

* Waheeda Rehman

* Asha Parekh

* Prem Chopra

It's a classic Hindi movie directed by Asit Sen and is renowned for its poignant storyline and compelling performances.