# Bending of Light from Reissner-Nordstr\"om-de Sitter-Monopole Black Hole

## TL;DR

This paper analyzes how light bends around a Reissner-Nordström-de Sitter black hole with a monopole, calculating deflection angles considering various parameters and the cosmological constant, providing insights into gravitational lensing effects.

## Contribution

It introduces a detailed calculation of light deflection in a complex black hole spacetime, including monopole and cosmological constant effects, up to second-order accuracy.

## Key findings

- Deflection angle depends on black hole and monopole parameters.
- Cosmological constant influences light bending in this geometry.
- Second-order corrections improve the precision of deflection estimates.

## Abstract

We study light deflection from a Reissner-Nordstr\"om-de Sitter black hole in the gravitational monopole background. We first calculate the orbit equation and the contribution of the monopole and black hole parameters to the deflection angle up to second-order for the vanishing cosmological constant case using the Rindler-Ishak method. We also obtain the contribution of the cosmological constant to light deflection in this geometry in the weak field limit using the same method.