Read Now: Physics Past Questions on Light Waves and Optics.

Introduction

Welcome to this class! In a previous lesson, we explored Physics questions on waves and light (optics). Today, we’ll continue with Physics past questions on optics, focusing on the law of reflection and its applications. If you haven’t studied our earlier topic on optics, I recommend revisiting it to strengthen your foundation.

Let’s get started with the questions and answers.

Question 1 – Law of Reflection

The first question asks:
In the law of reflection, what is the angle of incidence equal to?

Answer

According to the law of reflection, the angle of incidence is always equal to the angle of reflection.

Explanation

The angle of incidence is measured between the incident ray (incoming light) and the normal line at the point where the light strikes.
The angle of reflection is measured between the reflected ray and the normal line.
Hence, the law is expressed as: Angle of incidence (i) = Angle of reflection (r)

Applications of Reflection

Plane mirrors used at home and in vehicles.
Periscopes in submarines.
Optical devices such as telescopes and kaleidoscopes.

Exam Tip

In Physics exams (WAEC, JAMB, IGCSE, or any standard paper), always emphasize that the law of reflection works for both smooth and rough surfaces. This distinction shows a deeper grasp of the topic.

Watch the full tutorial here: https://www.youtube.com/watch?v=sO5wNACk0ds&t=6s

Conclusion

The law of reflection is a fundamental principle of optics. It explains how light behaves when it strikes reflective surfaces and underpins the design of many scientific instruments and everyday devices. Mastering this concept is essential for success in Physics exams at both high school and advanced levels.

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Keywords.

Physics past questions and answers
Physics optics past questions
Law of reflection Physics questions
Angle of incidence and reflection explained
Physics light waves questions and answers

Physics Past Questions on Light Waves and Optics.

Introduction