How Does Gravity Affect Light?

The video explores the relationship between light and gravity, starting with historical predictions by John Mitchell and Henry Cavendish. It delves into Einstein's general theory of relativity, explaining concepts like gravitational redshift and the equivalence principle. The video also covers the deflection of light by gravity, using Huygens' principle and Einstein's calculations, which were verified by Eddington's observations during a solar eclipse.

What did John Mitchell and Henry Cavendish incorrectly assume about light?

• That light behaves like a wave

• That light has mass

• That light cannot be deflected

• That light can be slowed down

According to Einstein's general theory of relativity, how does gravity affect light?

• It stops light completely

• It changes the color of light

• It bends the path of light

• It speeds up light

What is the equivalence principle?

• The idea that light is both a wave and a particle

• The concept that gravity and acceleration are indistinguishable

• The theory that time runs slower in gravitational fields

• The principle that light speed is constant

How does gravitational time dilation affect light?

• It increases the frequency of light

• It decreases the wavelength of light

• It causes light to redshift

• It makes light travel faster

What phenomenon explains the bending of light in gravitational fields?

• Refraction

• Reflection

• Diffraction

• Polarization

What principle did Huygens propose about waves?

• Waves can be described as point-like oscillations

• Waves are made of particles

• Waves travel faster in a vacuum

• Waves cannot bend

How did Einstein's calculation of light deflection differ from Cavendish's?

• It was half the deflection

• It showed no deflection

• It was twice the deflection

• It was the same as Cavendish's

What did Sir Arthur Eddington's expedition confirm?

• Newton's theory of gravity is complete

• The speed of light is constant

• Light is not affected by gravity

• Einstein's deflection angle was correct

What is the nature of light according to the video?

• Light is a wave-particle duality

• Light is purely a particle

• Light is unaffected by gravity

• Light is purely a wave

What is emphasized about the universe in the final section?

• The universe is static

• The universe is unpredictable

• The universe is self-consistent

• The universe is chaotic