1a. The distance of an object and its image is 20cm. A lens has a focal point of -30cm. Calculate the object distance, describe the image, and construct a ray diagram for the lens (not in scale).

1b. A 0.8Kg microphone is connected to a spring and is oscillating in simple harmonic motion up and down with a period of 3s. Below the microphone there is a source of sound with a frequency of 550Hz. Knowing that the change of frequency heard by the microphone is 1.8Hz, calculate the spring constant.

Expert Solution

genius_generous answered 2 years ago

For a diverging lens of focal length -20cm, for what object distance will the magnification of the image be 0.8?

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