Karate (1983)

A scientist creates a diamond that can focus sun-rays to burn through anything. The villain, in a bid to get the diamond, kills the scientist. The scientist's karate-learning sons, Desh and Vijay, are separated from each other and their mother. Vjay grows up with his karate instructor while Desh is reared by a gypsy camp. How they find each other and avenge their father's death forms the rest of the narrative.