A diverging lens is used to form a virtual image of an object.The object is 55 c

Question

A diverging lens is used to form a virtual image of an object.The object is 55 cm in front ofthe lens and the image is 27.5 cm in front of the lens. Determine the focallength of the lens. cm
The distancefrom the front to the back of your eye isapproximately 1.89 cm. If youcan see a clear image of a book when it is35.8 cm from your eye, what is the focal lengthof the lens/cornea system?
cm
A diverging lens is used to form a virtual image of an object.The object is 55 cm in front ofthe lens and the image is 27.5 cm in front of the lens. Determine the focallength of the lens. cm
The distancefrom the front to the back of your eye isapproximately 1.89 cm. If youcan see a clear image of a book when it is35.8 cm from your eye, what is the focal lengthof the lens/cornea system?
cm

Explanation / Answer

Distance of the object u = +55 cm

Distance of the image v = - 27.5 cm

From the relation ( 1/ u ) + ( 1/ v ) = ( 1/ f)

f = (1/55 - 1/27.5)-1 = -55 cm

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