In a setup of displacement method experiment, distance between the oreen and a light source is 120 cm and the lens used has a small anerture. By moving the lens between the source and the screen, sharp images are obtained on the screen for two different positions of the lens. The ratio of sizes of these two images is 1:9. 22.5 cm (a) What is the focal length of the lens? (6) Which image is the brighter one? Determine the ratio of the brightness of these two images. Smaller g fimes brigh
In a setup of displacement method experiment, distance between the oreen and a light source is 120 cm and the lens used has a small anerture. By moving the lens between the source and the screen, sharp images are obtained on the screen for two different positions of the lens. The ratio of sizes of these two images is 1:9. 22.5 cm (a) What is the focal length of the lens? (6) Which image is the brighter one? Determine the ratio of the brightness of these two images. Smaller g fimes brigh
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Transcribed Image Text:Jn a setup of displacement method experiment, distance between the
ween and a light source is 120 cm and the lens used has a small
onerture. By moving the lens between the source and the screen, sharp
images are obtained on the screen for two different positions of the lens.
The ratio of sizes of these two images is 1:9.
(a) What is the focal length of the lens? 225 cm
(6) Which image is the brighter one? Determine the ratio of the
brightness of these two images.
Smaller g times brighber
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