Let’s solve this step by step.
We are told:
- A laser beam hits a mirror at an
angle of incidence of 38 degrees.
- We need to find the
angle of reflection.
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Step 1: Understand the Law of Reflection
The law of reflection says:
> The angle of incidence is equal to the angle of reflection.
Both angles are measured from the
normal line — that’s the imaginary line perpendicular (at 90°) to the mirror surface at the point where the light hits.
So, if the angle of incidence = 38°, then the angle of reflection must also be 38°.
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Step 2: Check for tricks or extra info
Sometimes problems give you the angle between the ray and the *mirror*, not the normal. But here it clearly says “angle of incidence” — which by definition is measured from the normal. So no conversion needed.
Also, part (a) asks to draw the diagram — but since we’re only giving the final answer numerically, we focus on the calculation.
Part (b) says to measure with protractor — again, that’s for hands-on work. Our job is to calculate based on given data.
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Step 3: Final Calculation
Angle of incidence = 38°
→ Angle of reflection = 38° (by law of reflection)
No math beyond that. It’s direct application of the rule.
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Final Answer:
38
Parent Tip: Review the logic above to help your child master the concept of law of reflection worksheet.
