Reflection worksheet|KS3 Physics|Teachit - Free Printable

To solve this problem, we need to apply the Law of Reflection. This law has two main parts:
1. The angle at which the light hits the mirror (angle of incidence) is equal to the angle at which it bounces off (angle of reflection).
2. The incident ray (incoming), the normal line (the dotted line perpendicular to the surface), and the reflected ray (outgoing) all lie in the same plane.

Here is how to draw the diagrams step-by-step for each case:

General Steps for Drawing:

1. Identify the Normal: The normal is the dashed line sticking straight out from the mirror at a $90^{\circ}$ angle.
2. Measure the Angle of Incidence: Look at the angle between the incoming arrow (incident ray) and the normal line. Let's call this angle $\theta_i$.
3. Draw the Reflected Ray: Draw a new line starting from where the light hits the mirror. This line must go into the space on the *other side* of the normal.
4. Match the Angle: Make sure the angle between your new reflected ray and the normal is exactly the same size as the angle of incidence ($\theta_r = \theta_i$).
5. Add an Arrowhead: Put an arrow on the reflected ray pointing *away* from the mirror to show the direction of travel.

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Step-by-Step Solution for Each Diagram:

Diagram 1 (Top Left):
* The light comes in from the left, hitting the mirror at an angle.
* Notice the angle between the incoming ray and the vertical normal line. It looks to be about $45^{\circ}$.
* Action: Draw a ray going up and to the right. The angle between this new ray and the normal should look identical to the incoming angle. Add an arrow pointing away from the mirror.

Diagram 2 (Top Right):
* The light comes in from the left, but it is much closer to the mirror surface (grazing incidence). This means the angle with the normal is large (close to $90^{\circ}$).
* Action: Draw a ray going up and to the right. It should also be very close to the mirror surface. The angle between the reflected ray and the normal must match the large angle of the incoming ray. Add an arrow pointing away.

Diagram 3 (Middle Left):
* Similar to Diagram 1, the light comes from the left at a moderate angle.
* Action: Reflect it across the normal line to the right side. Ensure the "V" shape formed by the rays is symmetrical around the normal line. Add an arrow pointing away.

Diagram 4 (Middle Right):
* The light is coming from the *right* side towards the left.
* Action: Draw the reflected ray going up and to the *left*. The angle relative to the normal must be the same as the incoming angle. Add an arrow pointing away from the mirror.

Diagram 5 (Bottom Left):
* The light is coming from the right side, similar to Diagram 4 but at a different angle.
* Action: Draw the reflected ray going up and to the *left*. Match the angle with the normal. Add an arrow pointing away.

Diagram 6 (Bottom Right):
* The light comes from the left at a shallow angle (similar to Diagram 2).
* Action: Draw the reflected ray going up and to the right, staying close to the mirror surface. Match the angle with the normal. Add an arrow pointing away.

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Key Check:

For every diagram, if you were to fold the paper along the dotted "normal" line, the incoming ray should land perfectly on top of your drawn reflected ray. This symmetry is the best way to check if your drawing is correct.

Final Answer:
To complete the task, you must draw a reflected ray for each diagram. For each one:
1. Start the new line at the point where the incident ray touches the mirror.
2. Draw the line on the opposite side of the normal (dotted line) compared to the incident ray.
3. Ensure the angle between the reflected ray and the normal is equal to the angle between the incident ray and the normal.
4. Draw an arrowhead on the reflected ray pointing away from the mirror.