Physics - In a theater at night, a dancer performs wearing a blue sweater and white pants, and when a red spotlight is cast on the actor, the

the audience sees that the color of the actress' sweater is black. When the light is shone on the actress, the audience sees her because the light is diffusely reflected

Explanation: The blue sweater can only reflect blue light, so the red light shines on it and it does not reflect the red light, which appears as black

The actress's clothes are made of rough material, so the light is diffusely reflected, and the audience sees the actress from all directions

.