Mudar url

Olá pessoal. O efeito lightbox abaixo está na pagina1.php  e está funcionando normalmente. Quero que ao clicar na imagem o efeito lightbox aconteça e a url mude para pagina2.php .  Resolvido , obrigado a todos !

<style>
body {

font-family: Verdana, sans-serif;
margin: 0;
}

.div_pai{
display: none;
position: fixed;
z-index: 1;
padding-top: 100px;
left: 0;
top: 0;
width: 100%;
height: 100%;
overflow: auto;
background-color: rgba(41, 37, 37, 0.9);
}

.close {
text-align: right;
float: right;
color: #FFF;
position: absolute;
top: 2px;
font-size: 50px;
font-weight: bold;
background: #d40000;
border: 1px solid #d40000;

}

.close:hover,
.close:focus {

color: #FFF;
text-decoration: none;
cursor: pointer;
border: 1px solid #FFF;
}

.div_1 {
display: flex; flex-wrap: wrap;
background-color: #fefefe;
margin: auto;
max-width: 600px; width: 100%;
}

.img_1 {
margin: auto;
max-width: 600px; width: 100%;
border-radius: 8px;
transition-delay: 1s;
}

.mySlides {
max-width: 600px;
display: none;
}

.cursor {
cursor: pointer;
}

img {

margin-bottom: -4px;
}

img.hover-shadow {

transition: 0.3s;
}

.hover-shadow:hover {

box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}
</style>

<h2 style="text-align:center">Lightbox</h2>

 <img src="img1.png" style="width:200px" onclick="openModal()" class="hover-shadow cursor">

<div id="myModal" class="div_pai">

 <div class="div_1">
 <span class="close" onclick="closeModal()">×</span>
 <img class="img_1" src="img2.jpg" style="width:100%" alt="Nature and sunrise">
 </div>

</div>

<script>
function openModal() {
 document.getElementById("myModal").style.display = "block";
}

function closeModal() {
 document.getElementById("myModal").style.display = "none";
}

var slideIndex = 1;
showSlides(slideIndex);

function showSlides(n) {
 var i;
 var slides = document.getElementsByClassName("mySlides");

 if (n > slides.length) {slideIndex = 1}
 if (n < 1) {slideIndex = slides.length}
 for (i = 0; i < slides.length; i++) {
 slides[i].style.display = "none";
 }

}
</script>

	**Resolvido , obrigado a todos !**