2. When an object is placed 6cm from a certain converging lens, it for

1.	2. When an object is placed 6cm from a certain converging lens, it forms a real image. When the object is moved to 4cm from the lens, the image moves 1cm farther from the lens. Find the focal length of this lens.
Answer» so, the object u=-4 v=-1 1/f=1/v-1/u 1/f=1/-1-1/-4 1/f=-4+1/4 1/f=-3/4 f=-4/3

2. When an object is placed 6cm from a certain converging lens, it forms a real image. When the object is moved to 4cm from the lens, the image moves 1cm farther from the lens. Find the focal length of this lens.

Answer»

so,

the object

u=-4

v=-1

1/f=1/v-1/u

1/f=1/-1-1/-4

1/f=-4+1/4

1/f=-3/4

f=-4/3

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2. When an object is placed 6cm from a certain converging lens, it forms a real image. When the object is moved to 4cm from the lens, the image moves 1cm farther from the lens. Find the focal length of this lens.

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