Question

Which of the following is the correct lens formula?

• A. \( \dfrac{1}{v} - \dfrac{1}{u} = \dfrac{1}{f} \)
• B. \( \dfrac{1}{v} + \dfrac{1}{u} = \dfrac{1}{f} \)
• C. \( v - u = f \)
• D. \( v + u = f \)

Hint:

The lens formula is used to relate object distance, image distance, and focal length for lenses.

Answer 1

The Correct Option is A

Step 1: The lens formula relates the object distance \( u \), the image distance \( v \), and the focal length \( f \) of a lens.
Step 2: The correct formula is \( \dfrac{1}{v} - \dfrac{1}{u} = \dfrac{1}{f} \), which is valid for both converging and diverging lenses.

Final Answer: \[ \boxed{\dfrac{1}{v} - \dfrac{1}{u} = \dfrac{1}{f}} \]