An object is placed 100 cm in front of a lens of focal length 20 cm. A second lens is placed 15 cm past the first lens. The second lens has a focal length of 40 cm. The final image
A)is real and upright.
B)is virtual and upright.
C)is real and inverted.
D)is virtual and inverted.
E)cannot be determined with the information given.

Question

Quizplus · Accepted Answer

The first lens forms a real and inverted image because the object is placed outside the focal length. The image distance can be calculated using the lens formula (1/f = 1/v - 1/u), resulting in a real image 25 cm on the other side of the first lens. This image acts as a virtual object for the second lens, which is 15 cm away. Using the lens formula again for the second lens, the final image is real and inverted.

An Object Is Placed 100 Cm in Front of a Lens