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1. What is the focal length of a curved mirror if an object 2 meters in front of the mirror creates an image 1.5 meters

1. What is the focal length of a curved mirror if an object 2 meters in front of the mirror creates an image 1.5 meters behind the mirror?

2. What is the index of refraction of a material if a ray of light that has a wavelength of 500 nm in air has a wavelength of 275 nm in the material?

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