A mirror is used to produce an image with magnification of 1/4. If the distance between object and its image is 40 cm, then the focal length of the mirror is _ _ _.

Optics: JEE Main 2025 Physics question

JEE Main 2025 · 7 Apr, Evening shift · Q43

JEE Main 20257 Apr, Evening shiftPhysicsEasyOptics190× since 2002

A mirror is used to produce an image with magnification of

\frac{1}{4}

. If the distance between object and its image is 40 cm, then the focal length of the mirror is ______.

JEE Main 2025 · 7 Apr, Evening shift · Q43

JEE Main 20257 Apr, Evening shiftPhysicsEasyOptics190× since 2002

A mirror is used to produce an image with magnification of

\frac{1}{4}

. If the distance between object and its image is 40 cm, then the focal length of the mirror is ______.