A student places a candle flame at a distance of about 60 cm from a convex lens of focal length 10 cm and focuses the image of the flame on a screen. After that he gradually moves the flame towards the lens and each time focuses the image on the screen.
- In which direction-toward or away from the lens, does he move the screen to focus the image?
- How does the size of the image change?
- How does the intensity of the image change as the flame moves towards the lens?
- Approximately for what distance between the flame and the lens, the image formed on the screen is inverted and of the same size?
CBSE DELHI - SET 1 2017
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- As the candle is moved towards the lens, the image distance increases. Thus, the student moves the lens away from the screen to focus the image.
- The size of the image increases when the object is moved towards the lens.
- Intensity decreases.
- When the candle is moved very close to the lens, no image is formed on the screen. A virtual image is formed behind the candle on the same side of the screen.
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