Two lenses, one with a focal length f1 = +20 cm and the other with a focal lengt

Question

Two lenses, one with a focal length f1 = +20 cm and the other with a focal length f2 = 20 cm, are on the same axis and 60 cm apart as shown. A real object is 40 cm to the left of the positive lens. The image formed by the negative lens is

A) real and 10 cm from the negative lens.

B) virtual and 10 cm from the negative lens.

C) at infinity.

D) virtual and 20 cm from the negative lens.

E) None of these is correct.

Two lenses, one with a focal length f1 = +20 cm and the other with a focal length f2 = 20 cm, are on the same axis and 60 cm apart as shown. A real object is 40 cm to the left of the positive lens. The image formed by the negative lens is A) real and 10 cm from the negative lens. B) virtual and 10 cm from the negative lens. C) at infinity. D) virtual and 20 cm from the negative lens. E) None of these is correct.

Explanation / Answer

1st image at v =40 which is at the focus of 2. hence C> at infinity

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