Light undoubtedly exerts pressure on the lenses of reflector telescopes, and this pressure is twice the pressure exerted on a non-reflective surface.
Light will also exert pressure on the transparent objectives of refractor telescopes, since when light passes through a collecting lens, the component of photon impulses directed along the main optical axis decreases.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.