A telescope has an objective with a refractive power of 1.00 diopters and an eyepiece with a refractive power of 240 diopters. What is the angular magnification of the telescope?
It is -240 (the minus sign may not be required but indicates the image is inverted).
If you want an explanation...
Angular magnification= -fo /fe
Since power (in dioptres) is 1/focal length (in metres)
Angular magnification= -(1/Po)/(1/Pe) = - Pe/Po = -240/1.00 = -240
Comments
It is -240 (the minus sign may not be required but indicates the image is inverted).
If you want an explanation...
Angular magnification= -fo /fe
Since power (in dioptres) is 1/focal length (in metres)
Angular magnification= -(1/Po)/(1/Pe) = - Pe/Po = -240/1.00 = -240