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MSE2020LectureNotes_2_8

# MSE2020LectureNotes_2_8 - MSE 2020 Page 1 of 3 Lenses 1u...

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MSE 2020 2/8/2011 Page 1 of 3 Lenses + 1u 1v = 1F o u = object distance o v = image distance o F = focal length Magnification o = M vu Problem: If you have an object that is 2 cm from a lens (focal length = 1.5 cm), provide the magnification and the percentage decrease in image intensity for the final image o μ lens = 10 -3 cm -1 , μ air = 10 -4 cm -1 , average thickness of lens = 3 mm o u and v don’t include thickness of lens (for this problem) o + = . = - = → = 12cm 1v 11 5cm 1v 23 12 16 v 6 cm o = = = M vu 62 3 o = -( - )= . Ix1 e 10 4x2 9998 o = . -( - . )= . Ix2 9998xe 10 3x0 3 9995 o = . -( - )= . = Ix3 9995xe 10 4x6 9989 Ixf o 99.89% of original intensity remains (decrease in intensity = .11%) o Optical Microscopy See powerpoint slides on T-Square 2 main types of optical microscopes o Transmission (not used for materials science because you must be able to see through the sample and most materials are not transparent) o Reflection (used to get topological information about materials; e.g. grain

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MSE2020LectureNotes_2_8 - MSE 2020 Page 1 of 3 Lenses 1u...

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