Quest Ladder Community — TeachForge.ai · Browse all question types
Finding the image distance for a thin lens
- physics
- intermediate
- 14-16
Students use 1/f = 1/u + 1/v to find where a converging lens forms an image, then say whether it is real or virtual. The five variants keep the object beyond the focal point, so every answer is a real image and the arithmetic stays clean to one decimal place.
Sample question
A converging lens has a focal length of **12 cm**. An object is placed **36 cm** from the lens. \frac{1}{f} = \frac{1}{u} + \frac{1}{v} Calculate the image distance **v** in centimetres, to one decimal place.
Answer: 18.0