# [S4] Lesson 33 (Reflection + Refraction Year End Revision + Differentiation + Electrolysis EOY L3)

[S4 Physics PMCians]

What we did in 2 hours:

On 15th and 16th Aug, the S4 PH has come together to complete the following:

1) Secret Enclosed – Light Part I (Reflection and Refraction)

2) The Final Lap – Light Waves 1

Two things to remember:

1. For reflection: The three steps to drawing how the eye perceive the object through the mirror is the usual procedure we adopt to solve questions. Always remember that in order for an eye to see an image clearly, i) the rays from object to eye must not be obstructed, and ii) the point of incidence must be located on the actual mirror.

1. For refraction: TIR  occurs when i) light travels from optically denser to less dense medium, and ii) angle of incidence is bigger than critical angle. Always remember, in PMC, n2 is usually the optically denser medium.

Do remember to always bring your Secret Enclosed AND the revision books for all lessons.

What you take home:

In this coming week (Aug 22 and 23), we will continue our revision on Light II – Lens. Do remember to bring along your pencil and ruler for this lesson!!

Oh, Do remember to attend the online ZOOM this coming Tuesday (18th Aug 2020) as Mr Shane Wong will be sharing on the techniques to excel in Paper 3 – Practical. However, should you not able to make it for the session, please logon to pmc digital to watch the lesson at your own pace.

Special Mention:

Should you need assistance in your daily practices in Physics, do send your attempted workings and questions to 9100 1235. We will strive to clarify your doubts.

From the S4PH Team

(Mr Shane, Dr Li and Mr Gary)

[S4 Maths PMCians]

What we did in 2 hours:

This week, we focus on the application of differentiation.

So, in today tutorial we covered problems using the idea that the derivative of a function gives the rate of change of the function. We recapped on the 4 step approaches to solve them.

Next, we moved on to find maximum or minimum values of functions. The required condition is that the derivative be equal to zero. There are numerous practical applications in which it is desired to find the maximum or minimum value of a particular quantity and we all just need more practice to perfect it.

What you take home:

Solutions to The Last Lap – Take Away Questions and Differentiation Part 2 Q7-Q10

https://tinyurl.com/y2k2wubf

Solution to EM Revision – Real Life Application Problem

https://tinyurl.com/y5yyuhsu

Special Mention:

Next lesson we will start Integration Revision. See you either in zoom or onsite!

[S4 Chemistry PMCians]

What we did in 2 hours:

We completed our revision of electrolysis and are now capable of using an efficient generalisation of reactive/inert electrodes to simplify our problem solving processes in any type of electrical cell given to us. (i.e. reactive/inert cathodes – discharge cations only, reactive anode – dissolve, inert anode – discharge anions).

What you take home:

You are now able to complete the whole Take Home Package in preparation for our final revision lesson on electrolysis in simple cells.

Special Mention:

We are going into our revision of Energy Changes. Chemical reactions produce and absorb heat and this property allows chemists to develop useful real life items such as heat pads and self heating hotpots! Here’s a video: https://www.youtube.com/watch?v=80gjwykN0cU

REDEEM A FREE TICKET FOR YOUR FRIEND 🙂

We are pleased to inform you that you will be able to redeem a free ticket for your friend to attend lesson with you. You may redeem this ticket via your Student Portal, under Referral and Rewards.

Take note:

• This ticket can only be redeemed once.
• The guest must attend lesson either onsite or online with you at the same timeslot.
• Free ticket only applies to non-PMC students who have never attended any PMC lessons before.
• Redemption period strictly before 31 August 2020. See you!