Candle Image on an Optical Bench

In the picture

1. 1Candle flame: source of the light rays
2. 2Biconvex glass lens: bends the rays
3. 3Focal point mark on the rail: fixed focal distance from the lens
4. 4Upside-down candle image on the screen: sharp inverted image
5. 5Rail segment from lens to screen: image position

Examples

• A magnifying glass focusing sunlight into a bright spot
• A camera lens forming an upside-down image on its sensor

Quiz: Candle Image on an Optical Bench (Age 16)

1. 1

   According to the card, what does the biconvex glass lens do to the light rays from the candle flame?

   • It reflects the light rays back toward the candle.
   • It bends the light rays so they can form an image.
   • It absorbs the light rays so no image appears.
2. 2

   What is true about the real image formed by this lens on the screen?

   • It is upside-down but cannot be caught on a screen.
   • It is upside-down and can be caught on a screen.
   • It is upright and cannot be caught on a screen.
3. 3

   Which statement matches the card about the focal distance and the image position?

   • The image position is fixed, and the focal distance changes with the object distance.
   • Both the focal distance and the image position are fixed for every object distance.
   • The focal distance belongs to the lens, and the image position changes with the object distance.

The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.