The correct answer to the question is option 2, Uttarakhand. A "liid mirror telescope" is a type of telescope that uses a primary mirror made of liid, a type of metal. Recently, India commissioned its first liid mirror telescope, and this telescope is located in Uttarakhand.

Option 1, Himachal Pradesh, is not the correct answer. Option 3, Ladakh, is also not the correct answer. Option 4, Arunachal Pradesh, is also not the correct answer.

It is important to note that the term "liid mirror telescope" may not be a recognized term in the field of astronomy. It is possible that there may be a typo or error in the question or answer provided. However, based on the given options, the correct answer is option 2, Uttarakhand.