RAY OPTICS 7

Refraction through Lenses - Ray Optics

Module 1: Lens Formula and Magnification Lenses refract light to form images. The **lens formula** is: \[ \frac{1}{f} = \frac{1}{v} - \frac{1}{u} \] Where: - \( f \): Focal length - \( v \): Image distance - \( u \): Object distance **Magnification (M)** is given by: \[ M = \frac{h_\text{image}}{h_\text{object}} = \frac{v}{u} \] Where \( h \) represents the height.

1. A convex lens forms a real image when the object is placed:

2. The lens formula is valid for:

3. Magnification for a real image is:

4. For a lens with focal length \( 10 \text{ cm} \), the power is:

5. A lens with \( M > 1 \):