Lens combinations. You have two lenses - a converging lens with f = 3 cm and a d

Question

Lens combinations. You have two lenses - a converging lens with f = 3 cm and a diverging lens with f = -3 cm. You put them very close to each other. What is the effective focal length of the lens combination? What is the power of the lens combination? (Remember power is a quantity measured in diopters or 1/m.) What do these numerical answer you find mean? Or equivalently, what would you see through such a lens combination? Binocular vision Look at the world through one eye. Look at the world using both your eyes. Describe three differences you notice.

Explanation / Answer

f1 = 3 cm
f2 = -3 cm

1/f = 1/f1 + 1/f2
1/f = 1/3 - 1/3
f = infinity

Focal length of combination = infinity

Power = 1/f = 0

This combination will behave as simple surface and it will not affect direction of light

I am allowed to answer only 1 question at a time.
I have answered all parts of 1st question

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