There is a stick at an angle of 60 degrees with the horizontal plane. If the image of the stick in the mirror makes an angle of 60 degrees with the stick, the plane mirror makes an angle of (60) degrees or (120) degrees with the horizontal plane.
There is a passage in an ancient book: "Take a big mirror and hang it under the basin, and you can see your neighbor." "This is a device that uses the principle of (light reflection) to shoot the surrounding scenery, similar to (periscope).
There is a north-south river. One morning, the sun was shining brightly. Xiaoming took his camera to the river and took a picture of the scenery with reflection in the water. To this end, Xiaoming should stand on the (east) shore.
Except for large passenger cars, the front windows of most cars are inclined. Please use the optical principle to strengthen the intention of redesign to prevent the light from returning along the original road and affecting the driver's sight.
6. Doctors will wear (concave mirror) when examining the ear and nose of patients, because (concave mirror) can focus the light beam.