An image is formed using a convex lens,the image being 15 cm past the lens.A second lens is placed 25 cm past the first lens and another image is formed,this time 10 cm past the second lens.Which of the following statements is always true?
A)Both of the lenses have positive focal lengths.
B)The first lens is diverging,and the second is converging.
C)The first lens is converging,and the second is diverging.
D)None of the above statements is true.

Question

Quizplus · Accepted Answer

Convex lenses are converging lenses, which means they have positive focal lengths. The formation of real images past each lens indicates that both lenses are converging, thus having positive focal lengths.

An Image Is Formed Using a Convex Lens,the Image Being