Q.Corn leaves turning yellow
I planted sweet corn and popcorn 20 days back and sprayed medicine to reduce weeds. After spraying, the leaves are turning yellow and it seems that the plants are not healthy anymore.
They are now 5-6 inches tall. Please tell me how can I make the plants healthy again?

I would read the label of the chemical that you used and verify the concentration and application method.
Yellowing leaves can be due to several reasons.
These articles will help you pinpoint the cause.
https://www.gardeningknowhow.com/edible/vegetables/corn/yellowing-corn-leaves.htm
https://www.gardeningknowhow.com/edible/vegetables/corn/how-to-grow-corn.htm