lab phy2

2
D = v + u แแแ d= v - u แแแแแ แแแแแ แแแแแแแแแแ แแแแ แแแแแแแแแแแแ แแแแแ : D + d = 2v v = ( D + d ) / 2 แแแแ : D - d = 2u u = ( D - d ) / 2 แแแแ แแ 1/f = 1/u + 1/v ---> แแแแ แแ แแแแแแ แแแแ : f = ( u x v ) / ( u + v ) แแแ แ u แแแ v แแแ แแแแแ แแ f = { ( D + d ) /2 x ( D - d ) /2 } / { ( D + d ) /2 + ( D - d ) /2 } f = { ( D^2 - d^2 ) / 4 } / ( 2D /2 ) ### f = ( D^2 - d^2 ) / 4D

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D = v + u d= v - u : D + d = 2vv = ( D + d ) / 2 : D - d = 2uu = ( D - d ) / 21/f = 1/u + 1/v ---> : f = ( u x v ) / ( u + v )

u v f = { ( D + d ) /2 x ( D - d ) /2 } /{ ( D + d ) /2 + ( D - d ) /2 }

f = { ( D^2 - d^2 ) / 4 } / ( 2D /2 )

### f = ( D^2 - d^2 ) / 4D