Physics – NCEA 2.3 Waves – videos and notes to pass the exam
Our simulations are created by analysing exams from the past three years. Our research indicates that our sims include the type of questions that are likely to be asked in the final exams, and that those who use them can increase their learning speed and scores by over 100%. This is a sample only and our sims will offer more questions, videos and tests. Click on the hyperlinks in the table below to watch the short videos that clearly explain how to answer the questions. We are confident these sims will help you to learn how to solve the questions and help you pass your final exams. Send these links to your friends and help them too.
- Click here to download the notes for the Concave Lens questions.
- Click here for sample test questions and solutions.
| Concave lens Questions | Click on the hyperlinks to watch the video |
|---|---|
| Question 1a | Leon is viewing an image with a lens. The object is placed 9 cm away from a CONCAVE Lens with a focal length of 6 cm. What is the distance between the image and the lens? (Be careful; concave lenses have a virtual focus. The focal length is negative and the distance, di, will be too). |
| Question 1b | The object is 4 cm High. What is the height of the image? |
| Question 1c | What is the nature of the image (is it virtual or real)? |
| Question 2a | Leon is viewing a second image. The object is placed 5 cm away from a CONCAVE Lens with a focal length 8 cm. What is the distance between the image and the lens? (Be careful; concave lenses have a virtual focus. The focal length is negative and the distance, di, will be too). |
| Question 2b | The object is 6 cm high. What is the height of the image? |
| Question 2c | What is the nature of the image (is it virtual or real)? |
| Question 3 | Leon is given another image. The object is placed 6 cm from a concave lens and gives an image reduction factor of 4. What is the focal length of the lens? (Be careful; concave lenses have a virtual focus. The focal length is negative and the distance, di, will be too) |
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