Magnifier Stamp
Physics help quickly please!?
A stamp collector uses a lens of 7.3 cm focal length as a simple magnifier. The image Virtual is generated at the point near normal (25 cm). (A) How far from the lens must be placed the stamp? (B) What is the angular magnification expected?
Hello from the virtual image is the image distance di = negative. Now, use 1 / f = 1/7.3 = + 1/do 1/di 1/do - 1 / 25 = 5.65 cm only (= distance of the object) When the image is in the distance near the point of the angular magnification m = m (near point) / f + 1 = 25/7.3 + 1 = 4.43. In this case, the magnification is equal to the expansion as defined by m = DI / DO = 25/5.65 = 4.43. Cordially
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March 19th, 2010 in
Jewelry Repair