Hi Aspirant,

I assume by t.y. BSc you are trying to say third year BSc. If this is what you are referring to then , yes you can complete BSc in Physics after BSc in chemistry. One can pursue more than one undergraduate degree in different subjects one after one. Procedure for taking admission into BSc Physics in 1st year is same as you would have taken admission into BSc Chemistry 1st year.

For more information regarding BSc Physics and colleges providing the course refer the link below,

https://www.careers360.com/courses/physics-course

Hope this helps.

Good luck!!!