Gravitational lensing and black hole shadows are one of the strongest observational evidences to prove the existence of black holes in the universe. The gravitational lensing arises due to the deflection of light by the gravitational field of a gravitating body such as a black hole. Investigation of the shadow cast by a compact object as well as deflection of light around it may provide the useful information about physical nature of the particular compact object and other related aspects. In this paper, we study the deflection of light by a dual charged stringy black hole spacetime derived in dilaton-Maxwell gravity. The variation of deflection angle with the impact parameter for different values of electric and magnetic charges is studied. We also study the shadow of this black hole spacetime to obtain the radius of shadow cast by it. We have considered an optically thin emission disk around it and observed that there are not significant changes in the shadow cast by this black hole compared to well-known Schwarzschild black hole spacetime in GR.

中文翻译：

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双电荷丝状黑洞投射的光影偏转

引力透镜和黑洞阴影是证明宇宙中存在黑洞的最强观测证据之一。引力透镜是由于黑洞等引力体的引力场使光发生偏转而产生的。对致密物体投射的阴影及其周围光线偏转的研究可以提供有关特定致密物体的物理性质和其他相关方面的有用信息。在本文中，我们研究了由膨胀子-麦克斯韦引力导出的双带电丝状黑洞时空对光的偏转。研究了不同电荷和磁荷值下偏转角随冲击参数的变化。我们还研究了这个黑洞时空的阴影，以获得它投射的阴影半径。