Light

taught by Math Arena

Course description

Overview

This course is targeted at Singapore Cambridge GCE O level students, but is also relevant to IGCSE students and Singapore's Integrated program students.

Tired of fumbling around in the dark with vague explanations and difficult formulas? This course covers all the fundamental concepts of light in short, easy-to-understand videos with a focus on understanding physics phenomena and the reasons why each of these formulas appear the way they are. We guarantee that this will be an illuminating experience.

Course Content

You will learn:

  • How light reflects
  • How light refracts
  • Snell's law, refractive index and total internal reflection
  • The weird and wacky effects of thin converging lenses
  • The equally weird and wacky effects of thin diverging lenses
  • Why you only need a mirror half as tall as you are to see your entire reflection
  • Lots of other cool stuff! (Some of the videos in this course are marked as "explanation videos", which go into greater depth on the topics covered. We try to bring in out-of-syllabus concepts where possible to make things more interesting and give a more complete understanding of the topic)

A link to the full O level Physics syllabus can be found here

Course Prerequisites

You will need to know:

  • How to watch videos on your computer
Math Arena
Math Arena

The instructor is from Math Arena.The instructor is absolutely passionate about teaching and you'll find the lessons engaging and ultimately rewarding.

Course Curriculum

Reflection - Ray diagrams
31:21
Q15 A man drills a tiny hole at the 40 cm mark of a meter long ruler. He places a 30 cm long plane mirror in front of the ruler as shown. What are the minimum and maximum readings...
Q16 A painter leans back against a pointed wall while looking into a 1 m long mirror at the opposite end of a rectangular room. How much of the painted wall can he see through the 1 m long mirror?
Q17 A plane mirror AB is positioned at the corner of a road as shown in the plan view below. Which men can the observer see through mirror?
Q18 Two mirrors (facing each other) and an object O are places in the grid as shown. At which position(s) can the virtual image of object O be formed?
Q18 explanation
Q19 Four light bulbs are concealed from an observer by an opaque wall as shown. Without shifting the positions of the observer and the bulbs, how many bulbs can the observer see from the mirror?
Q20 Three objects P, Q and R are viewed through a plane mirror as shown. When an obstacle is moved towards the mirror, which of the objects will disappear first and which will disappear last?
Q21 The figure below shows Joe and Peter standing in front of an 8.0 m long mirror. Joe stands 2.0 m away from the left edge of the mirror, facing it...
Q22 The ray from a laser pointer hits a plane mirror and the reflected ray strikes a screen. How far away from the point X should the ray strike the mirror to cause the reflected ray to hit point R?
Q23 An observer O cannot see the image of target T through the mirror. What is the minimum distance he should move to see the image of target T through the mirror?
Refraction - Angle of refraction, Snell's Law
21:01
Q27 A ray of light travels from air to glass as shown below. Given that the refractive index of air is 1.0 and the refractive index of glass is 1.5, what is the angle of refraction, r?
Q28 A ray of light travels from air to water as shown below. Given that the refractive index of air is 1.0, what is the refractive index of water?
Q29 A ray of light travels from water to air as shown below. Given that the refractive index of air is 1.0 and the refractive index of water is 1.3, what is the angle of incidence, i?
Q30 A ray of light travels from glass to air as shown below. Given that the refractive index of air is 1.0, what is the refractive index of glass?
Q31 A ray of light travels from water to glass as shown below. Given that the refractive index of water is 1.3 and the refractive index of glass is 1.5, what is the angle of refraction?
Q32 A ray of light travels from diamond to glass as shown below. Given that the refractive index of diamond is 2.0 and the refractive index of glass is 1.5, what is the angle of incidence?
Q33 A ray of light travels from water to diamond as shown below. Given that the refractive index of water is 1.3, what is the refractive index of diamond?
Q34 A ray of light travels from air to diamond as shown below. Given that the refractive index of air is 1.0 and the refractive index of diamond is 2.2, what are the angles ABD and EBC?
Q35 A light ray travels from a medium P to medium Q. Given that medium P has a refractive index of 1.0 and medium Q has a refractive index of 1.2, which of the following is a possible refracted ray?
Q36 A light ray travels from a medium P to medium Q. Given that medium P has a refractive index of 1.5 and medium Q has a refractive index of 1.0, which of the following is/are possible refracted ray(s)?
Q37 A light ray passes through a rectangular glass block as shown in the diagram below. What is the refractive index of the glass?
Q38 Which of the following minimize the gap x?