# Single lens telescope

## TL;DR

This paper introduces a novel single lens telescope design that expands light rays while maintaining collimation at both input and output, supported by an analytical model and ray tracing validation.

## Contribution

The paper presents the first analytical model for a singlet lens telescope that adapts the second surface to achieve collimation, validated through ray tracing simulations.

## Key findings

- The model successfully achieves collimation at input and output.
- Ray tracing results confirm the model's effectiveness.
- The design simplifies telescope construction with a single lens.

## Abstract

We present a singlet lens that behaves like a telescope, it expands light rays and at the incoming and outgoing the rays are collimated. Therefore we called singlet lens telescope. The analytical model adapts the second surface when the first surface is given, in order that at the output the rays are collimated. We test the model using ray tracing tracking for several input surfaces and the results are quite satisfactory.