You observe, at normal incidence, light of wavelength 672 nm reflected off the (air) interface between a plano-convex lens (curved side down) touching a flat piece of glass. You see a dark central spot surrounded by rings of darkness. The smallest ring has radius 178 μm. If the lens is made of glass with refractive index 1.521, what is the focal length of the lens in cm? Correct Answer is: 9.05cm My answe is:7.17cm
You observe, at normal incidence, light of wavelength 672 nm reflected off the (air) interface between a plano-convex lens (curved side down) touching a flat piece of glass. You see a dark central spot surrounded by rings of darkness. The smallest ring has radius 178 μm. If the lens is made of glass with refractive index 1.521, what is the focal length of the lens in cm? Correct Answer is: 9.05cm My answe is:7.17cm
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You observe, at normal incidence, light of wavelength 672 nm reflected off the (air) interface between a plano-convex lens (curved side down) touching a flat piece of glass. You see a dark central spot surrounded by rings of darkness. The smallest ring has radius 178 μm. If the lens is made of glass with refractive index 1.521, what is the focal length of the lens in cm?
Correct Answer is: 9.05cm
My answe is:7.17cm
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