The correct answer is: A. Car headlights
Parabolic mirrors are used in car headlights to focus the light and create a beam that projects far down the road. This helps drivers see better at night and in low-light conditions.
Option B, driving mirrors, are typically flat mirrors that are used to help drivers see behind them. They are not used to focus light, so parabolic mirrors are not necessary.
Option C, dentists’ mirrors, are used to help dentists see inside patients’ mouths. They are typically small, round mirrors that are held in the dentist’s hand. Parabolic mirrors are not typically used in dentists’ mirrors.
Option D, shaving mirrors, are typically small, handheld mirrors that are used to help people shave. They are not used to focus light, so parabolic mirrors are not necessary.
In conclusion, parabolic mirrors are used in car headlights to focus the light and create a beam that projects far down the road. This helps drivers see better at night and in low-light conditions.