Light

• Light enters the eye through the pupil, which is controlled by the iris.
• The lens focuses light onto the retina at the back of the eye.
• The human eye is an optical instrument that allows us to see.
• The cornea refracts (bends) incoming light rays to focus them on the retina.
• The ciliary muscles control the shape of the lens, allowing it to change its curvature and adjust the focal length of the eye.
• The iris controls the amount of light entering the eye.
• The iris controls the amount of light entering the eye by adjusting its size.
• The cornea covers the front part of the eyeball and helps focus incoming light rays on the retina.
• Light travels in a straight line
• Refraction occurs when light changes direction as it passes through different mediums with varying densities
• Light travels at 186,000 miles (300,000 km) per second,
• Light is made up of electromagnetic waves that travel in all directions from their source.
• Infrared radiation has longer wavelengths than visible light but shorter ones than radio waves.
• Visible light has wavelengths between 400 nanometers (violet) to 750 nanometers (red).
• Radio waves have the longest wavelengths of any type of EM wave.
• Gamma rays are the shortest wavelengths of all types of electromagnetic radiation.
• X-rays have still shorter wavelengths than ultraviolet radiation.
• Ultraviolet radiation has even shorter wavelengths than those of violet light.
• The speed of light is constant regardless of its frequency or intensity.
• When an object absorbs energy from sunlight, it heats up due to the transfer of kinetic energy from photons to molecules within the object.
• The speed of light is constant regardless of its direction or the observer's motion.
• Electromagnetic waves can be described as transverse waves because they oscillate perpendicular to the direction of energy transfer.