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is gravitational force act on light or not???????
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by einsteins relativity, gravity acts on matter and light alike
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Direct answer: Light also travels along geodesics (callednull geodesics), and so paths of light are also curved by gravitational force, despite the light not having any mass.
This is a wonderful question … in the first instance, it’s answered by Einstein’s theory of general relativity. (Spoiler alert, light travels along geodesics, which are approximately straight lines in most circumstances that humans encounter in everyday life, but are curved by gravity). It’s also interesting because there is some sense in which light does have “mass” (and therefore should be influenced by gravity… read on!)
In our everyday experience, light seems to travel in straight lines, unaffected by gravity. Of course, light can bend when it passes through the interface between two media — think of light refracting as is passes from air into water, which is the phenomenon that causes a straw in a glass of water to appear kinked at the interface. But that bending is not gravitational; it’s electromagnetic.
However, light does bend when travelling around massive bodies like neutron stars and black holes. This is explained by Einstein’s theory of general relativity.
This is a wonderful question … in the first instance, it’s answered by Einstein’s theory of general relativity. (Spoiler alert, light travels along geodesics, which are approximately straight lines in most circumstances that humans encounter in everyday life, but are curved by gravity). It’s also interesting because there is some sense in which light does have “mass” (and therefore should be influenced by gravity… read on!)
In our everyday experience, light seems to travel in straight lines, unaffected by gravity. Of course, light can bend when it passes through the interface between two media — think of light refracting as is passes from air into water, which is the phenomenon that causes a straw in a glass of water to appear kinked at the interface. But that bending is not gravitational; it’s electromagnetic.
However, light does bend when travelling around massive bodies like neutron stars and black holes. This is explained by Einstein’s theory of general relativity.
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