Question

A diverging lens (f1 = -12.0cm) is located 50.0 cm to the left of a converging lens (f2 = 34.0 cm). A 2.0 cm-tall object stands to the left of the diverging lens, exactly at its focal point. Determine the distance of the final image relative to the converging lens in centimeters.

Answer 1

The final image relative to the converging lens is 34 cm.

Step-by-step explanation:

Given that,

Focal length of diverging lens = -12.0 cm

Focal length of converging lens = 34.0 cm

Height of object = 2.0 cm

Distance of object = 12 cm

Because object at focal point

We need to calculate the image distance of diverging lens

Using formula of lens

`(1)/(v)=(1)/(f)-(1)/(u)`

`(1)/(v)=(1)/(-12)-(1)/(-12)`

`v=\infty`

The rays are parallel to the principle axis after passing from the diverging lens.

We need to calculate the image distance of converging lens

Now, object distance is ∞

Using formula of lens

`(1)/(v)=(1)/(34)-(1)/(\infty)`

`v=34`

The image distance is 34 cm right to the converging lens.

Hence, The final image relative to the converging lens is 34 cm.