the rays that enter the medium.

(a)  

an angle forms from the normal line.

(a)  

an angle formed between the incident light ray.

(a)  

it can be obtained by using the equation in Snell's Law.

(a)  

it is a formula developed by the Dutch Mathematician Willebrord Snellius.

(a)  

he developed the formula of Snell's Law

(a)  

it is an optical illusion in which the light coming from the sky bends continuosly.

(a)  

the transparent or translucent optical instrument

(a)  

it refracts light at both boundaries of the material.

(a)  

it is composed of thin convex edges that thicken at the center.

(a)  

this lens has three types which is the double convex lenses, plano-convex lenses, and meniscus convex lenses.

(a)  

it consists of thick concave surfaces that thin down across the center.

(a)  

this lens has three types which is the double concave lenses, plano-concave lenses, and meniscus concave.

(a)  

they occur whenever light rays strike the surface of objects.

(a)  

it takes place when the surface forms a mirror image of a physical object or a person.

(a)  

they are some of the most common optical instruments used every day.

(a)  

they are like windows through which light enters and enables you to see.

(a)  

they are about an inch in diameter.

(a)  

this is the part that process light include the cornea, sclera, lens, retina, and optic nerve.

(a)  

it is the clear protective outer layer of the eye.

(a)  

it is the white part of the eye.

(a)  

it is the eye's natural lens, as well as the eye's internal fluids.

(a)  

it is a nervous tissue composed of millions of nerve cells that convert into light rays.

(a)  

it refers to the tendency of the eye to focus only on distant objects.

(a)  

this happens when the cornea has a limited curvature.

(a)  

it can be corrected through the use of glasses with converging lenses.

(a)  

it is the difficulty of viewing distant objects that occurs when the light coming into the eyes is not focused properly on the retina.

(a)  

eyeglasses with diverging lenses must be used to correct this condition.

(a)  

it is an eye condition that causes blurred vision due to an irregularly - shaped cornea or an asymmetrical lens curvature.

(a)  

it can be diagnosed through a routine eye exam conducted by an optometrist.

(a)  

a special type of eyeglasses with cylindrical lenses are used to correct the vision of a patient with (a)   .

it is an optical instrument designed particularly for magnifying the tiniest elements of the universe.

(a)  

it is composed of objective lenses, an eyepiece lens, and the focusing mechanisms that adjust the clarity of the image.

(a)  

it makes up the top of the microscope's body.

(a)  

this is where the observer looks through and views a magnified virtual image of a specimen.

(a)  

it is below the tube magnify the view of the specimen by refracting the light rays that it reflects.

(a)  

a telescope that makes use of lenses, which collects weak light from the heavenly object and magnifies the image.

(a)  

it makes use of mirrors which bend parallel light rays and make them converge.

(a)  

it is one of the most common; it uses a flat mirror that directs the reflected rays to an eyepiece.

(a)  

it uses a primary mirror with a hole in the middle and a convex secondary mirror.

(a)  

it uses a secondary convex mirror and an angled mirror.

(a)  

this optical instrument consists of two small side by side telescopes, one for each eye.

(a)  

it dates back to Aristotle's time.

(a)  

it could not produce long lasting photographic images.

(a)  

it involves a closed box with a tine hole though which light passes and projected an inverted image.

(a)  

it consists of a smaller box with an ocular tube in the middle and a cloth

(a)  

it is a portable camera box prominently from the late 19th century until the early 21st Century.

(a)  

this needs to be "developed" or be exposed to more chemicals that react with their light.

(a)  

it is an advanced photography in the 21st century.

(a)  

The force exerted by magnets when they attract or repel each other.

(a)  

it is a substance that possesses magnetic properties.

(a)  

it has a property of attracting iron particles to it.

(a)  

it is a material or object that produces a magnetic field.

(a)  

materials that can be made into magnets.

(a)  

they are made by induced magnetism.

(a)  

magnet that aren't always magnetic.

(a)  

it is a magnet that can be switched on and off.

(a)  

it is also used to lift heavy objects in the industrial sites.

(a)  

magnets whose magnetic strength never fades.

(a)  

the strongest permanent artificial magnet commercially available anywhere in the world.

(a)  

it is the areas of greatest magnetic force.

(a)  

it is the mixture of two or more metals.

(a)  

this refers to the region of space in which a magnetic force exists.

(a)  

the arrowhead shows the direction of the magnetic line of force which comes out of the N Pole and enters the S Pole.

(a)  

it is the shape crowds the line of force together between the two poles.

(a)  

he was a French physicist who became prominent for his discovery of Electromagnetism.

(a)  

he was a French physicist who became prominent for his discovery of Electromagnetism.

(a)  

he described the magnetic field through Magnetic Line of Force.

(a)  

he discovered that a moving wire through a magnetic field could produce an electric current.

(a)  

he discovered that an electric current is surrounded by a magnetic field.

(a)  

he created the oersted law.

(a)  

he has said that the current produced by a magnetic field is an induced current.

(a)  

it is a phenomenon of including voltage by changing the magnetic field in a conductor.

(a)  

it states that the induced voltage in a coil of wire is equal to the product of the number of loops.

(a)