Question 1
Figure below shows an object O placed in front of a plane mirror. A ray of light is drawn coming object O and striking the mirror at P. After striking the mirror, the ray of light is reflected.
- Which of the four dots represent correct position of the image of O? Label this dot Q
- By drawing a line on the diagram above to represent the reflected ray at P, mark the angle of reflection and label it r.
Answer
Question 2
- State the characteristics of images formed by a pinhole camera.
- What is the effect on the image when the camera is elongated?
Answer
- Real - Inverted
- The size of the image increases
Question 3
The figure below shows the object O and its image O1 formed by a concave mirror. Locate the position of the principle focus
Answer
Question 4
An electromagnet is made by winding insulated copper wire on an iron core. State three changes that could be made to increase the strength of the electromagnet.
Answer
- Increase the current
- Increase the number of turns per unit length / increase windings
- Use of a U-shaped core
- Increase the number of turns per unit length / increase windings
- Use of a U-shaped core
Question 5
Figure below shows a U-shaped magnet stored with a keeper
Answer
- The keeper is magnetized.
- This makes the dipoles to form a closed ioop
- This makes the dipoles to form a closed ioop