Reflection in mirrors — final check

1. define / determine / describe

(a) Define the normal at a mirror. (b) Define the angle of incidence. (c) After reflecting off a plane mirror, a ray of light makes an angle of 53° with the surface of the mirror. Determine the angle of incidence. (d) Supplement. The reflected ray in (c) travels on to a second plane mirror, which is parallel to the first and faces it. Determine the angle of incidence at the second mirror. (e) Supplement. Describe the direction of the ray that leaves the second mirror, compared with the ray that hit the first mirror.

(a) The normal

(b) The angle of incidence

(c) The angle of incidence here

(d) Supplement: the angle of incidence at the second mirror

(e) Supplement: the direction of the ray that leaves

2. describe / state / determine

(a) Describe how a plane mirror forms an image of a point object. (b) State three properties of the image. (c) An object stands 27 cm in front of a plane mirror and does not move. The mirror is moved 9 cm further away from the object. Determine how far the image moves. (d) Supplement. Seen from above, a small torch bulb is 30 cm in front of a long plane mirror. The ray from the bulb that reaches an eye hits the mirror 6.0 cm to the right of the normal through the bulb. The eye is 23 cm to the right of that normal. Determine how far the eye is from the mirror.

(a) How the image forms

(b) Three properties

(c) How far the image moves

(d) Supplement: the distance of the eye from the mirror