  Graphene constitutes one of the key elements in many functional van der Waals
heterostructures. However, it has negligible optical visibility due to its
monolayer nature. Here we study the visibility of graphene in various van der
Waals heterostructures and include the effects of the source spectrum, oblique
incidence and the spectral sensitivity of the detector to obtain a realistic
model. A visibility experiment is performed at different wavelengths, resulting
in a very good agreement with our calculations. This allows us to reliably
predict the conditions for better visibility of graphene in van der Waals
heterostructures. The framework and the codes provided in this work can be
extended to study the visibility of any 2D material within an arbitrary van der
Waals heterostructure.
