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Various lens experiments
The video below shows a typical lens experiment. (reference to O-Level SciPhy 2015). I will briefly go through the set-up, main steps and...
Evan Toh
Oct 25, 20241 min read
72 views
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Minimum distance h mirror from the floor
Answer: Option B
Evan Toh
Oct 24, 20241 min read
13 views
0 comments
Different Converging Lens Ray Diagram questions
Drawing ray diagrams for converging lens come in many forms. But the basic concepts needed are the 3 rays (which have rules to follow) to...
Evan Toh
Oct 24, 20241 min read
283 views
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Converging Lens – Which ray is correct after passing through the lens
Which of the following light rays behaves correctly when it passes through the converging lens? Solutions: Option C Recall these basic...
Evan Toh
Oct 24, 20241 min read
10 views
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What is Total Internal Reflection (TIR)?
Overview of Total Internal Reflection (TIR) Explanation of the various stages:
Evan Toh
Oct 21, 20241 min read
103 views
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Evan Toh
Oct 17, 20240 min read
73 views
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Finding focal length f of the lens using pin and mirror or sharp image from distance object
A thin convex lens is placed on a plane mirror and an object pin is then moved along the axis of the lens until an image is seen to...
Evan Toh
Sep 30, 20242 min read
125 views
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Light and sound wave diagram in different mediums with different density
Light and sound are both waves. So both carry energy from one place to another. Light , which is part of the electromagnetic spectrum,...
Evan Toh
Sep 30, 20241 min read
95 views
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Lens – Complete the rays S and T as they pass through the lens
To do similar questions, it is important to know the 3 rays which have rules to follow in order to locate the image. Look through the...
Evan Toh
Sep 30, 20241 min read
24 views
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Light Experiments – Glass Block and Pins
The video include 3 different light experiments which involve glass block and pins. Most students faced difficulties in locating the pins...
Evan Toh
Aug 31, 20241 min read
45 views
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2010SPp1q12 Lens - focal length definition
Answer: Option C Focal length f is the distance between the focal point and the centre of the lens (optical centre) . Note that only...
Evan Toh
Jan 1, 20241 min read
8 views
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Total Internal Reflection (TIR) example 01
Solutions: a) Refraction   b) 48.6o   c) c = 41.8o   e) 70o d) Total internal reflection has occured, as the angle of incidence is...
Evan Toh
Dec 31, 20231 min read
69 views
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Converging Lens Overview
1. Converging lens (convex lens) Converging lens, also known as convex lens, is thicker at the centre. Below shows some examples. In...
Evan Toh
Dec 31, 20232 min read
118 views
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Different Lens Ray Diagram questions
Drawing ray diagrams for converging lens come in many forms. But the basic concepts needed are the 3 rays (which have rules to follow) to...
Evan Toh
Dec 31, 20231 min read
146 views
0 comments
Pins inside and outside of beaker filled with water – 2012 sciphy practical
A pin in the beaker of water appears higher than its actual position due to refraction of light. In this experiment, you have to adjust...
Evan Toh
Dec 31, 20231 min read
6 views
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Evan Toh
Dec 31, 20230 min read
119 views
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Evan Toh
Dec 31, 20230 min read
33 views
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Identifying what lens, focal length and image from 2 rays – PP2010P1Q23 and SP2014P1Q11
These 2 questions are actually the same. Q23 is from 2010 Pure Physics P1 while Q11 is from 2014 Sci Physics P1. Take a look at these 2...
Evan Toh
Dec 31, 20231 min read
7 views
0 comments
Where is the focal point of lens L1 and L2?
Answer: Option A Refer to the diagram (below left) which many are familiar. When parallel rays of light which are parallel to the...
Evan Toh
Dec 31, 20231 min read
4 views
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Evan Toh
Dec 31, 20231 min read
6 views
0 comments
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