• Consider a room stationary on earth. Objects in this room will fall down due to gravity.
• Consider other room accelerating in space. Objects in this room will fall due to inertia.
• A light beam in inertial room will strike opposite wall slightly lower than starting level. Thus light is affected by inertial force.
• As inertial and gravitational forces are same, light must be affected by gravitational force.
• This lead to new definition of gravity for heavy mass.
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