(a) How far from a 53.8 mm focal-length lens must an object be placed if its ima

Question

(a) How far from a 53.8 mm focal-length lens must an object be placed if its image is to be magnified 2.50? and be real?
mm

(b) What if the image is to be virtual and magnified 2.50??
mm (a) How far from a 53.8 mm focal-length lens must an object be placed if its image is to be magnified 2.50? and be real?
mm

(b) What if the image is to be virtual and magnified 2.50??
mm (a) How far from a 53.8 mm focal-length lens must an object be placed if its image is to be magnified 2.50? and be real?
mm

(b) What if the image is to be virtual and magnified 2.50??
mm

Explanation / Answer

a) real so q>0 so M = -2.5

so q = 2.5 p

1/(2.5 p) + 1/p = 1/53.8E-3

p=0.0753 m = 75.3 mm

b) if virtual q = -2.5 p

1/(-2.5 p) + 1/p = 1/53.8

p=32.28 mm

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