Weak-field deflection
Gravitational Lensing
Light takes a different path when gravity changes the geometry of its journey.
Launch Simulation ↗
CAPTURED IN TUDUNI LABORATORYTHE PHYSICS
A closer look.
For a distant source and weak gravitational field, mass bends a passing light ray by this approximate angle.
α ≈ 4GM / (b c²)
G is the gravitational constant, M and m are masses, r is separation, c is the speed of light, and b is impact parameter where applicable.
What you can learn
- Vary mass and impact parameter
- Compare bent rays with straight references
- Identify where weak-field assumptions fail
Default bodies
The preset's central gravitating mass and light emitter
CAPTURED IN TUDUNI LABORATORYThe weak-field ray model is an approximation and is invalid close to a black-hole horizon. Magnified ray deviation is a display aid.
Space fabric illustrates gravitational influence; it is not a numerical solution of the full Einstein field equations. Visual sizes can be enlarged independently of physical collision radii.