Respuesta :
An object should be placed 6.343cm in front of the magnifier if the image is formed at the observer's near point, a distance of 25.0 cm in front of her eye.
We use lens formula which is given by
1/v-1/u=1/f
where v is the distance of the image from the lens, u is the distance of the object from the lens and f is the focal length of the lens.
We have distance of image from lens(v) as= - 25cm(since image is forming on left side of lens)
Also, we have focal length of lens as 8.50cm
So, putting this on above formula
=>1/(-25)-1/u=1/8.50
=>1/u=(1/8.50)+(1/25)
=>1/u=(25+8.50)/(25×8.50)
=>u=(25×8.50)/33.50
=>u= 6.343cm
Hence, an object should be placed from the magnifier at a distance of 6.343cm.
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(Complete question) is:
How far in front of the magnifier should an object be placed if the image is forming at the observer's near point, 25.0 cm in front of her eye? The focal length of the simple magnifier is 8.50 cm Assume the magnifier to be a thin lens placed very close to the eye.
