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Drexel University
How far from a $23-\mathrm{cm}$-focal-length lens should you place an object to get an upright image magnified $2.5$ times? At what distance should an object be placed from a lens of focal length 25 cm to obtain its image on a screen placed on the other side at a distance of 50 cm from the lens? What will be the magnification produced in this case? Given that, Focal length, f = 25 cm Image distance, v = 50 cm Form the lens formula, `1/v-1/u=1/f` (where u = object distance) `"or", 1/u=1/v-1/f` `=1/50-1/25` Therefore, `1/u=(-1)/50` Or, u = −50 cm Magnification, `m=v/u` `=50/(-50)` = -1
The object must be placed 50 cm away from the lens, on the other side to produce a magnification of −1. Concept: Magnification Due to Spherical Lenses Is there an error in this question or solution? |