Thin Lens Optics: Problem-Solving and Lens Makers' Formula
Explore the principles of thin lens optics through problem-solving examples, including calculations for focal length, lens power, and lens curvature radii. Learn about the Lens Makers' Formula and how to determine the radii of curvature for equiconcave lenses made of specific materials.
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Presentation Transcript
Lect. Discussion chapter 4( thin lens) Part 1 Optics Reference Fun. Of optics Lecture Dr.Mariam M.Abud
Step of solution 1.1 Solve problem ?+ 1 ? =1 ??? ?+? ? 4.1 An object located 12.0 cm in front of a thin lens has its image formed on the opposite side 42.0 cm from the lens. Calculate (a) the focal length of the lens and (b) the lens power. Ans. (a) +9.33 cm, (b) + 10.72 D a) ? = Solve 4.2, 4.4 ,4.11,4.18
LENS MAKERS' FORMULA Supposing the index to be known, the radii of curvature must be so chosen as to satisfy the equation
4.5 An equiconcave lens is to be made of flint glass of index 1.750. Calculate the radii of curvature if it is to have a power of - 3.0 D. Ans. Both 50.0-cm radius R1<0 R1=-ve Solve problem 4.3,4.4,4.6,4.9 1 ? 1 3? = 1.75 1 -3 = 0.75? 2 r = 50 cm ? r = 0.5 m ?
