Final answer:
To decrease light exposure when a photo is overexposed, you can either reduce the aperture size or increase the shutter speed. Adjusting the flash intensity using the - option on a camera's +/- flash options can also help.
Step-by-step explanation:
Decreasing Light Exposure in Photography
If your light meter indicates that your exposure is overexposed, there are a couple of ways you can decrease the amount of light entering your camera to achieve a better-exposed photo. The first method is to reduce the aperture size (increase the f-stop number), which decreases the size of the opening through which light enters. The second way is to increase the shutter speed, so the sensor is exposed to light for a shorter period. These adjustments will help you prevent overexposure and avoid areas of the photo appearing "blown out" or excessively bright without details.
Additionally, if you're dealing with flash photography and experiencing overexposure, you can adjust the flash intensity using your camera's +/- flash options. Decreasing flash intensity with the - option can also help reduce the amount of light reaching the sensor, assisting in achieving the desired exposure.