Blu ray players have laser lenses. Some blu ray players have a single lens and some have dual lenses. The difference will be that some can only play blu ray discs and some can play both blu ray and regular dvds.
The type of lense is a convex lense
Fresnel lens
double convex
HDMI is a type of cable used for domestic high definition television signals. All Bluray players use HDMI as their HD connection to televisions but there is no such thing as an HDMI player.
The small magnifying lens used by jewelers and watchmakers is a loupe.
== == It is used to magnify/ or make things appear closer?to magnify small objects
A concave lens is used to correct nearsightedness, also known as myopia. This type of lens diverges light rays before they reach the eye's lens, thus moving the focal point back to the retina for clearer vision.
A magnifying glass typically uses a convex lens. This type of lens converges light rays to create a magnified image when placed close to an object.
convex lens
A converging lens, such as a plano-convex or double-convex lens, is typically used to focus the sun's rays. This type of lens helps concentrate the sunlight onto a specific spot to create heat or produce energy.
A magnifying lens makes objects appear larger by bending light to focus and enlarge the image. This type of lens is convex in shape and is commonly used in magnifying glasses and microscopes.
A photometer used for measuring light intensity typically uses a lens that focuses the light onto a sensor or detector. The type of lens used can vary depending on the specific application and the desired level of accuracy or sensitivity required for the measurements.