What is difference between magnification and linear magnification

1.	What is difference between magnification and linear magnification
Answer» The\xa0difference\xa0is that of measure;\xa0linear\xa0magnification\xa0is used when projecting an image on a screen and\xa0angular\xa0when viewing through an eyepiece. Linear\xa0Magnification\xa0is the ratio of the projected image size (measured with a ruler) over the actual size. Angular\xa0magnification\xa0is the ratio of the tangent of the angle subtended at the focal point of the eyepiece over the angle subtended at the focal point of the objective.\xa0Linear\xa0is clear and easy - but you cannot do a\xa0linear\xa0calcuation for a\xa0magnification\xa0system with an eyepiece as there is no screen so we use the ratio of the angles (or their tan) instead as this can be observed. If something without\xa0magnification\xa0covers 1 degree - with 5x\xa0Angular\xa0magnification\xa0it will appear to cover ~5 degrees (at low mag and angles you can almost ignore the tangent).

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