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Hello Chandrakanta,
The Bachelor degree course in Physics acts as the base to study various higher education courses. Upon completion of the course, the candidate can go for Masters degree in various specialized areas. There is provision to go for higher education after Masters degree in physics. The list of the possible courses after B.Sc physics are mentioned below.
Master of science (M.Sc) courses are offered in areas mentioned here:
1. Physics.
2. Applied physics and ballistics.
3. Applied physics.
4. Bio physics.
5. Engineering physics.
6. Geophysics.
7. Marine geo physics.
8. Medical physics.
9. Renewable energy.
Ph.D courses in physics:
1. Doctor of philosophy (Ph.D) in applied physics.
2. Doctor of philosophy (Ph.D) in biophysics.
3. Doctor of philosophy (Ph.D) in chemical thermodynamics.
4. Doctor of philosophy (Ph.D) in kinematics.
5. Doctor of philosophy (Ph.D) in nuclear physics.
6. Doctor of philosophy (Ph.D) in physics.
7. Doctor of philosophy (Ph.D) in thin films.

Hello Swarajshree,
You should not get too fascinated with ethical hacker as they show in movies. Hackers mean "thieves". No company would hire a thief to steal other company's data as that could land them in serious legal trouble. Most of the institutes provide just a basic fancy course under the name of ethical hacking, just to attract students and earn more.
I would rather recommend you to go for security specialist professionals. These jobs are highly payable and in high demand as most companies need them to protect their own data. These jobs work on the same logic that the best thief can protect the data in the best way.
For the same, you can go to some reputed computer training institutes like NIIT, etc. You can go for Java courses followed by networking courses and CCNA/CCNB (CISCO) courses. After this, you can also opt for CEH (Certified Ethical Hacker) certification courses, if you wish to. The cost of these courses varies from institute to institute. You can contact a reputed institute in your city for course and fees details.
Ensure you do these courses alongside a degree course (BCA, B.Tech, B.Sc, etc.) for better outcome.
I hope I have been able to answer your queries to your satisfaction.If so, kindly upvote this answer.If you've any further questions, kindly revert.

Overall review regarding my experience is that IBS Mumbai is well known for inviting 250 companies every year at the time of final placements . There are various cultural and domain clubs in IBS Mumbai which gives you a chance to participate in cultural as well as non cultural (Domain) events of the Inter college festivals. IBS being an autonomous institute is also known for its students having academics credentials at large. The institute is well known for its placements, college events and academics. The fee structure is such that the entire fees for 2 years is 7,10,000 rupees, out of which 10,000 would be refundable at the end of the 2 years. The mode of payment is via Demand Draft of 1,26,000 which needs to be paid at the beginning of the every semester.