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Physics: Draw Image of Object in Plane Mirror Using Reflection Laws
Physics
Grade 10 of Junior High School (German Education System)
Question Content
12) Zeichnen Sie anhand der charakteristischen Strahlen die Bilder (6 P). (Diagram shows an incident ray hitting a plane mirror, with normal line drawn)
Correct Answer
Image is virtual, upright, same size as object, located behind mirror at same distance as object from mirror. Reflected ray follows law of reflection: angle of incidence = angle of reflection.
Detailed Solution Steps
1
Step 1: Recall Law of Reflection: The angle of incidence (between incident ray and normal) equals the angle of reflection (between reflected ray and normal).
2
Step 2: Draw the reflected ray: Measure the angle of incidence from the incident ray to the normal, then draw the reflected ray on the other side of the normal with the same angle.
3
Step 3: Recall plane mirror image properties: Image is virtual (cannot be projected on screen), upright, same size as object, and located at the same distance behind the mirror as the object is in front.
4
Step 4: Draw the image: Extend the reflected ray behind the mirror, and draw the object's image as a symmetric copy across the mirror surface.
Knowledge Points Involved
1
Law of Reflection
The law of reflection states that when light reflects off a surface, the angle of incidence (θᵢ) equals the angle of reflection (θᵣ), where both angles are measured relative to the normal (a line perpendicular to the surface at the point of incidence).
2
Plane Mirror Image Properties
Plane mirrors form virtual, upright, laterally inverted images that are the same size as the object. The image is located at the same distance behind the mirror as the object is in front of the mirror, and the mirror is the perpendicular bisector of the line connecting the object and its image.
3
Virtual vs Real Images
A virtual image is formed by the apparent divergence of light rays (rays do not actually meet at the image location), so it cannot be projected onto a screen. Real images are formed by actual convergence of light rays and can be projected onto a screen. Plane mirrors form only virtual images.
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