Yes, the light from a flashlight will disperse when you point it up. When a flashlight is pointed upward, the light emitted from the flashlight bulb spreads out in various directions due to a phenomenon called light scattering.
Light scattering occurs when light interacts with particles or molecules in the atmosphere. As the light travels through the air, it encounters tiny particles such as dust, water droplets, or air molecules. These particles cause the light to scatter in different directions, resulting in a wider dispersion of the light beam.
When you point a flashlight upward, the emitted light encounters more particles and molecules in the atmosphere, leading to increased scattering. As a result, the light beam becomes less focused and more spread out. This dispersion of light is more noticeable in darker environments where the contrast between the illuminated area and the surrounding darkness is more apparent.
It's worth noting that the degree of light dispersion can vary based on factors such as the power and design of the flashlight, the clarity of the atmosphere, and the distance between the flashlight and the point of observation.