A lens forms a real image, which is 253cm away from the object and 12/3 times its length. A) anwser: conv...

Question

Question

A lens forms a real image, which is 253cm away from the object and 12/3 times its length.

A) anwser: converging lens

B) What is its focal length??

units in cm

Answer 1

Answer #1

u+ v = 253 cm

m = v/u = 5/3

v = 5u/3

u + 5u/3 = 253

8u = 253*3

u = 94.875 cm

v = 158.125 cm

finally f =-uv/u+v

f = 158.125*94.875/(158.125+94.875)

f = 59.59 = 60 cm

Answer 2

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