In India the best viewing distance for a TV depends on several factors, including the size of the TV and the resolution it supports. There are some general guidelines you can follow to determine an optimal viewing distance, but personal preferences may vary.
For High-Definition (HD) TVs (720p,
1080p), a common rule of thumb is to sit about 1.5 to 2.5 times the diagonal
screen size away from the TV. For example, if you have a 50-inch HD TV, the
recommended viewing distance would be approximately 6.5 to 10.5 feet (2 to 3.2
meters).
For 4K Ultra High-Definition (UHD)
TVs, which have a higher pixel density and provide more detail, you can sit
closer to the screen without seeing individual pixels. A good guideline for 4K
UHD TVs is to sit about 1 to 1.5 times the diagonal screen size away from the
TV. Using the same example of a 50-inch TV, the recommended viewing distance
for a 4K UHD TV would be approximately 4.2 to 6.5 feet (1.3 to 2 meters).
Personal Preference: The above guidelines provide an average
recommendation, but personal preference also plays a role. Some people may
prefer sitting closer or farther away from the TV based on their visual acuity,
the level of detail they want to see, and their comfort.