A

Step 1: Evaluate the statements one by one.
- Option A claims that IR radiations are used for long-distance photography. This is misleading because while infrared (IR) cameras can be used for thermal imaging, regular long-distance photography typically relies on visible light.
- Option B states that IR radiations arise due to inner electron transitions in atoms. This statement is true as IR radiation can be emitted when electrons transition between energy levels in atoms or molecules.
- Option C mentions that IR radiations are detected by using a bolometer. This is accurate since bolometers are indeed sensitive devices used to measure infrared radiation.
- Option D asserts that the sun is a natural source of IR radiation. This is also true, as the sun emits a range of electromagnetic radiation, including infrared.
Step 2: Since Option A is not true in the context of typical long-distance photography, it is the correct choice.
Therefore, the answer is A.