- PHYSICS FORM 4 -

- HOLIDAY ASSIGNMENT-

INTRUCTION:

1. Please make a mind mapping on Chapter 3 (Forces and Pressure)– Examples of

concept map is provided.

2. Make sure you use a piece of A3 Drawing Block to complete the mind mapping.

3. It should be completed with subtopic for each of the chapter

4. Make it as creative as you can and colourful

ANSWER SCHEME OF WEEKEND HOMEWORK

Mark your weekend homework answer by referring the answer scheme below.

Hand-in your weekend homework to your physics teacher during the first physics class

Tqsm

Happy marking….. xoxo

The centre of curvature, C of a curved mirror is a centre of a sphere that forms the mirror.

✓ P has a smaller surface of curvature

✓ Q has a bigger surface of curvature

✓ For P, the reflected light rays meet at a point further from the mirror. Therefore, it has a

bigger focal length

✓ For Q, the reflected light rays meet at a point nearer the mirror. Therefore, it has a smaller

focal length

✓ If the curvature of the mirror increases, the focal length of a mirror decreases

(ii) The image is real, inverted and diminished

(ii) The image is virtual, upright and diminished

✓ The two plane mirror are placed at the two ends of the long carboard tube

✓ The two mirrors are placed inclined at 45° to the horizontal plane as shown in Diagram

below:

The image are not clear because:

✓ Multiple reflections can occur in a mirror and this causes the superposition of images

✓ A mirror will not reflect all the light energy that falls on it

✓ To produce clearer images – replace the plane mirrors with two glass prisms

✓ There are no multiple reflections in a glass prism

✓ all the light energy is reflected by total internal reflection

✓ To produce bigger images – place a convex lens to act as a magnifier in front of the prism

at the viewing end