Abstract We consider a congruence of null geodesics in the presence of a quantized spacetime metric. The coupling to a quantum metric induces fluctuations in the congruence; we calculate the change in the area of a pencil of geodesics induced by such fluctuations. For the gravitational field in its vacuum state. we find that quantum gravity contributes a correction to the null Raychau... https://mandisattictoyers.shop/product-category/building-toys/