Bifocal.
When you say "glasses", it is plural. A "glass" is one of the lenses. "Glasses" would refer to both of the lenses, and a "pair of glasses" doesn't mention anything about the frame, but it mentions the two lenses. The frame is the object that joins the two lenses so you don't have to wear contacts and so it can stay on your head. When you say "a pair of glasses", you are referring to the "pair of lenses", not the frame. The frame holding the two lenses makes us think that it is one object, when the word "glasses" refers only to the lenses, not the frame. That is why it is called "a pair of glasses".
a calorie
compound light microscope
The compound microscope is called compound because the modifier compound means "two or more." A compound microscope has two or more lenses lenses. This is to be distinguished from a simple microscope which has one lens. Such a microscope is structurally equivalent to a magnifying glass, though not necessarily a hand held lens.
The compound microscope is called compound because the modifier compound means "two or more." A compound microscope has two or more lenses lenses. This is to be distinguished from a simple microscope which has one lens. Such a microscope is structurally equivalent to a magnifying glass, though not necessarily a hand held lens.
Bifocals
The term "bifocal" refers to eyeglasses with two distinct optical powers, typically used to correct both nearsightedness and farsightedness in a single lens.
Yes, two lenses can make a simple microscope. More are usually used. A magnifying glass - one lens - is the simplest microscope.
When you say "glasses", it is plural. A "glass" is one of the lenses. "Glasses" would refer to both of the lenses, and a "pair of glasses" doesn't mention anything about the frame, but it mentions the two lenses. The frame is the object that joins the two lenses so you don't have to wear contacts and so it can stay on your head. When you say "a pair of glasses", you are referring to the "pair of lenses", not the frame. The frame holding the two lenses makes us think that it is one object, when the word "glasses" refers only to the lenses, not the frame. That is why it is called "a pair of glasses".
a compound microscope
A piece of glass with one or two spherical surfaces is called a lens. Lenses are commonly used in optics to refract light and focus images.
Two large objective lenses.
Curved glass bends light rays due to refraction, where the change in speed of light as it passes from air to the glass causes it to change direction. The curvature of the glass surface also plays a role in how the light is refracted, which can be used in technologies like lenses and curved displays to manipulate the path of light.
a calorie
compound light microscope
The crystalline lens in the human eye and the lens found in a squid's eye are two examples of lenses that occur in nature.
The compound microscope is called compound because the modifier compound means "two or more." A compound microscope has two or more lenses lenses. This is to be distinguished from a simple microscope which has one lens. Such a microscope is structurally equivalent to a magnifying glass, though not necessarily a hand held lens.