Question

The magnification (m) in a concave lens is equal to:

• A. \(uv\)
• B. \(\frac{u}{v}\)
• C. \(\frac{v}{u}\)
• D. \(u+v\)

Hint:

For concave lens, the image formed is always virtual, erect and diminished.

Answer 1

The Correct Option is C

Step 1: Definition of magnification.
Magnification produced by a lens is defined as the ratio of the image distance (\(v\)) to the object distance (\(u\)):
\[ m = \frac{v}{u} \] Step 2: Application in concave lens.
In concave lens, the image is always virtual, erect and diminished, hence \( m = \frac{v}{u} \) (always less than 1).
Step 3: Conclusion.
Thus, magnification in a concave lens is \(\frac{v}{u}\).