The Right to Information (RTI) Act, 2005, marked a paradigm shift in Indian governance, empowering citizens to access information held by public authorities. Its primary objectives were to promote transparency and accountability, curb corruption, and foster good governance. Over the past decade and a half (since its enactment), the Act has undoubtedly made significant strides, but its journey has also been fraught with challenges and limitations.

Achievements of the RTI Act, 2005:

1. Enhanced Transparency: The Act has compelled public authorities to proactively disclose information and respond to citizen queries, significantly reducing the opacity that once characterized government functioning. Citizens can now scrutinize government decisions, expenditures, and policies.
2. Increased Accountability: By making officials answerable for their actions and inactions, the RTI Act has instilled a greater sense of responsibility. It has exposed instances of corruption, inefficiency, and maladministration across various levels of government.
3. Citizen Empowerment: The Act has empowered ordinary citizens, enabling them to demand information on public services, welfare schemes, and local governance issues, thereby fostering participatory democracy.
4. Tool for Social Justice: RTI has been effectively used by activists and common people to unearth scams, ensure proper implementation of development projects, and secure entitlements, particularly for marginalized sections of society.
5. Judicial Scrutiny: The Act has also brought the judiciary under its ambit, leading to greater transparency in judicial appointments and administration, though with certain limitations as seen in case law.

Limitations and Challenges:

Despite its successes, the RTI Act faces several hurdles:

1. Misuse and Frivolous Applications: Critics argue that the Act is sometimes misused for personal vendettas, harassment, or to seek trivial information, burdening public authorities. However, this argument is often countered by proponents who emphasize that the right to information should not be curtailed based on potential misuse.
2. Lack of Awareness and Capacity: A significant portion of the population, especially in rural areas, remains unaware of their RTI rights or lacks the capacity to file effective applications.
3. Resistance from Public Authorities: Many public information officers (PIOs) and government departments exhibit resistance, often delaying responses, providing incomplete information, or outright rejecting applications without valid reasons. This necessitates appeals to higher authorities, prolonging the process.
4. Protection of Whistleblowers: While the Act promotes transparency, the lack of robust whistleblower protection mechanisms often deters individuals from exposing corruption, fearing reprisal.
5. Dilution of the Act: Recent amendments to the RTI Act, particularly concerning the tenure and service conditions of Information Commissioners, have raised concerns about the independence and autonomy of these crucial bodies, potentially weakening the Act's effectiveness.

Exceptions and Case Law:

The RTI Act itself provides for certain exemptions under Section 8 and 9, balancing the right to information with other public interests such as national security, privacy, commercial confidence, and ongoing investigations. These exceptions are crucial for the practical implementation of the Act:

• Section 8(1)(a): Information prejudicially affecting the sovereignty and integrity of India, security, strategic, scientific or economic interests of the State, relation with foreign State or leading to incitement of an offence.
• Section 8(1)(j): Information which relates to personal information the disclosure of which has no relationship to any public activity or interest, or which would cause unwarranted invasion of the privacy of the individual.

Key Case Law:

1. Central Public Information Officer, Supreme Court of India v. Subhash Chandra Agarwal (2019): This landmark Supreme Court judgment affirmed that the office of the Chief Justice of India (CJI) is a 'public authority' under the RTI Act. It held that judicial independence does not mean immunity from accountability and that transparency is crucial. However, it also emphasized the need to balance transparency with the right to privacy of judges and the need to protect the independence of the judiciary, particularly concerning collegium resolutions and judges' assets. The court ruled that information regarding judicial appointments and assets could be disclosed, subject to the 'public interest' test and the right to privacy.

2. Reserve Bank of India v. Jayantilal N. Mistry (2015): The Supreme Court held that the RBI cannot claim exemption from disclosing information under the RTI Act merely because it is held in a fiduciary capacity. The court emphasized that the RBI has a public duty to protect the interests of the public and the nation, and therefore, information related to financial institutions and their defaulters should be disclosed in the larger public interest.

3. Girish Ramchandra Deshpande v. Central Information Commission (2012): The Supreme Court held that information relating to the service records, assets, and liabilities of a public servant is personal information and its disclosure would amount to an unwarranted invasion of privacy under Section 8(1)(j) of the RTI Act, unless there is a larger public interest involved.

In conclusion, the RTI Act, 2005, has been a powerful instrument for promoting transparency and accountability in India. While it has achieved significant success in empowering citizens and exposing malpractices, its full potential is yet to be realized due to implementation challenges, resistance from authorities, and recent legislative changes. Continuous vigilance, robust enforcement, and public awareness campaigns are essential to ensure the Act remains a potent tool for good governance.