Light & Optics Flashcards
What is the law of reflection
Angle of incidence is equal to the angle of reflection
How do you measure the angle of incidence and the angle of reflection?
Use a protractor to measure the angle between the incident ray and the normal (angle of incidence). Measure the angle between the reflected ray and the normal (angle of reflection), and they should be equal.
What is refraction
Refraction is the bending of light as it passes from one medium to another. This bending occurs due to a change in the speed of light between the two media.
What are the two types of lens’ ?
A convex lens converges light rays, while a concave lens diverges them. Convex lenses are used for farsightedness, and concave lenses are used for nearsightedness.
What causes nearsightedness?
nearsightedness occurs when the eye is too long or the lens is too strong, causing light to focus in front of the retina. It is corrected with concave lenses to diverge the light entering the eye.
What causes farsightedness?
farsightedness occurs when the eye is too short or the lens is too weak, causing light to focus behind the retina. It is corrected with convex lenses to converge the light entering the eye.
Key part of the eye?
The cornea bends light to focus it, and the pupil controls the light entering the eye. The lens further focuses the light onto the retina, which sends signals to the brain via the optic nerve.
How does a convex lens affect light?
A convex lens converges light rays to a focal point. It is used in magnifying glasses and for farsightedness correction
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What is white light and how does it relate to the spectrum?
White light is a mixture of all visible colors. When passed through a prism, it disperses into the spectrum (ROYGB).
What is the em spectrum in order? (Longest waves to shortest)
radio waves, microwaves, infrared, visible light(ROYGBP), ultraviolet, x-rays and gamma rays
How does the concave lens affect light?
A concave lens diverges light rays. It is used to correct nearsightedness by spreading the light before it enters the eye.
What happens when light reflects on a plain mirror?
Light reflects off a plane mirror in such a way that the angle of incidence equals the angle of reflection. The image formed is virtual and upright.
