The lens power increases as the curvature of the lens surface becomes steeper. A lens with a larger radius of curvature will have a lower power, while a lens with a smaller radius of curvature will have a higher power. This relationship is described by the lensmaker's equation, which relates the power of a lens to the refractive index of the lens material and the radii of curvature of its surfaces.
A lens of short focal length has a greater power (than a lens of large focal length)
The medium lens on the nosepiece of a microscope is typically the 10x objective lens. This lens is often referred to as the "low power" lens and is used for general observation and initial focusing of the specimen.
scanning objective
A divergent beam.
multipluing lenses
You can change the power of a single-lens microscope by adjusting the distance between the lens and the specimen. Moving the lens closer to the specimen increases the magnification, while moving it farther away decreases the magnification.
multipluing lenses
You can't, if you mean a microscope with a single, tiny, spherical lens. A sphere allows you to observe an object closer to your eye than 10 inches (which is conidered the closest, normal viewing distance for the human eye). A sphere one inch in diameter allows you to observe an object just as close (or one inch). Since this is ten times closer to your eye, the object appears with a magnification of 10 power. If you want to see an object (through a single lens) with even more magnification, you need a smaller sphere. It's possible to produce spheres with diameters less than 1/10th of an inch. A single spherical lens that small creates maginifications of 100 power. Onwards and Upwards, Paul
multipluing lenses
multipluing lenses
The lens power increases as the curvature of the lens surface becomes steeper. A lens with a larger radius of curvature will have a lower power, while a lens with a smaller radius of curvature will have a higher power. This relationship is described by the lensmaker's equation, which relates the power of a lens to the refractive index of the lens material and the radii of curvature of its surfaces.
SLR stands for a single lens reflex camera. Unlike a point and shoot camera, you can change lenses and are able to view your subject through the lens.
The power of a lens depends on the differences in the refractive indices of the environment and the lens material. A glass lens immersed in water will loose power (a positive lens will focus at a greater distance). (This is for normal glass with refractive index greater than water - there could be glasses with refractive index less than water in which case the lens would gain power)
The revolving nosepiece or turret rotates to change from the low power objective lens to the high power objective lens on a microscope. This component allows for easy switching between different objective lenses without the need to manually remove and insert them.
Digital SLR referes to "digital single-lens reflex." This terminology is often used when speaking about cameras. Such cameras can allow the photographer to change lenses as he or she sees fit.
A magnifying lens