The document describes a physics numerical tool for analyzing light reflection and refraction using mirrors and lenses. It provides formulas for calculating the position, nature, and size of the image based on object distance, focal length, and object size. The nature of the image is determined by the sign of the magnification, indicating if the image is real or virtual.

1. Light: Reflection & Refraction Physics
Numerical Tool
“Find the Position, Nature & Size of the image formed by Mirror & Lens”
Given:
Object distance (u): Negative [always]
Focal length (f): Negative [for Concave mirror or lens]
Positive [for Convex mirror or lens]
Size of Object (h1): Positive [always]
Solution:
1. Position of Image (v)
For mirror
Mirror Formula
vuf
111
+=
=v ____cm
2.Nature of the Image
Linear Magnification
u
v
m −= m has no units
If m negative [Image will be Real & Inverted]
Positive [Image will be Virtual & Erect]
3.Size of the Image (h2)
Linear Magnification
1
2
h
h
m =
=2h _____cm