Health Canada administers the Radiation Emitting Devices Act (REDA) and its Regulations, which cover the sale, lease, advertisement, and importation of radiation emitting devices, including lasers. It's the responsibility of the manufacturer, importer or distributor to ensure their laser product complies with the applicable requirements set out in REDA and its regulations.

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For these reasons, a controlled laser safety environment and professional laser safety training are necessary for the safe operation of Class 3B and 4 laser products.

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How Doesamicroscope Worksimple

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Over the course of the microscope’s history, technological innovations have made the microscope easier to use and have improved the quality of the images produced. The compound microscope, which consists of at least two lenses, was invented in 1590 by Dutch spectacle-makers Zacharias and Hans Jansen. Some of the earliest microscopes were also made by a Dutchman named Antoine Van Leeuwenhoek. Leeuwenhoek’s microscopes consisted of a small glass ball set inside a metal frame. He became known for using his microscopes to observe freshwater, single-celled microorganisms that he called “animalcules.”

For example, Class 3B and 4 handheld portable lasers are considered a danger to human health or safety under the Canada Consumer Product Safety Act. Their sale, import, advertisement and manufacture are prohibited in Canada.

The example of the warning label for a laser product has a triangular shape, with a yellow background and black border. A black laser starburst hazard symbol is in the centre.

Class 3B and Class 4 handheld portable lasers are considered a danger to human health or safety. Their import, manufacture, advertising and sale is prohibited under the Canada Consumer Product Safety Act.

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Even a quick look into the beam of any visible laser, at any classification, can result in temporary effects such as dazzle, flash blindness or afterimages. Looking into the beam of a Class 3R laser can cause serious damage to the eyes. An eye injury can also occur if someone looks at a Class 1M or 2M laser through a telescope, binoculars or a magnifying lens.

Laser products categorized as Class 3R or lower can be operated safely if used as directed and should always be used with caution. Here are a few guidelines to reduce your risk.

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Example of an explanatory label, in English, appropriate for a Class 4 laser product. The label has a rectangular shape, with a yellow background and black border. In the centre of the label is a warning, in black and uppercase: DANGER − LASER RADIATION. AVOID EYE OR SKIN EXPOSURE TO DIRECT OR SCATTERED RADIATION CLASS 4 LASER PRODUCT

Changes have been made to the Radiation Emitting Devices Regulations (laser products) concerning the scope of products and safety requirements for lasers that are imported, sold or leased in Canada. These changes were published in Canada Gazette, Part II, on October 9, 2024 and take effect 1 year after this date.

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Example of an alternative label, in English, appropriate for a Class 4 laser product. The label has a rectangular shape, with 5 panels bordered in black. The 4 panels on the top have a white background. Panel 1 shows the warning label. Panel 2 has an exclamation mark in a yellow triangle, the word DANGER on a red background, and the words LASER 4. Panel 3 has a red cross-out symbol and an eye that is exposed to a laser beam. Panel 4 has a red cross-out symbol and a hand that is exposed to a laser beam. Panel 5 has a yellow background and a black legend in the centre. The following words are in uppercase: AVOID EYE OR SKIN EXPOSURE TO DIRECT OR SCATTERED RADIATION

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A microscope is an instrument that is used to magnify small objects. Some microscopes can even be used to observe an object at the cellular level, allowing scientists to see the shape of a cell, its nucleus, mitochondria, and other organelles. While the modern microscope has many parts, the most important pieces are its lenses. It is through the microscope’s lenses that the image of an object can be magnified and observed in detail. A simple light microscope manipulates how light enters the eye using a convex lens, where both sides of the lens are curved outwards. When light reflects off of an object being viewed under the microscope and passes through the lens, it bends towards the eye. This makes the object look bigger than it actually is.

The dissecting microscope provides a lower magnification than the compound microscope, but produces a three-dimensional image. This makes the dissecting microscope good for viewing objects that are larger than a few cells but too small to see in detail with the human eye. The compound microscope is typically used for observing objects at the cellular level.

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"Laser" is an acronym that stands for "Light Amplification by Stimulated Emission of Radiation." A laser typically emits a very focused and intense beam that can travel long distances. Some laser products are safe, but others can be very dangerous and can lead to injury if safety measures are not taken.

Under the International Electrotechnical Commission (IEC) Standard 60825-1, laser products are categorized in the following order, from the lowest to highest potential hazard: Class 1, 1C, 1M, 2, 2M, 3R, 3B and 4. Classifying lasers according to their hazard level helps determine the necessary control measures to reduce the risk of eye and skin injuries. These measures include engineering safety features that are built into the device, warning labels, and user information.

The manufacturer of a laser product should also provide a user manual or instructions for safe assembly, maintenance and operation. The specific information that must accompany a laser product depends on the intended application and the hazard classification. Make sure to read the information carefully to understand the potential hazards and how to avoid them.

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Handheld lasers and laser pointers are popular and widely available in Canada. Battery powered handheld lasers may resemble pens or flashlights. These are most commonly used to point at objects in lectures or presentations. However, they may also be advertised for other uses. A simple handheld laser pointer can be more than a million times brighter than the average 100-watt light bulb in your home.

A microscope is an instrument that can be used to observe small objects, even cells. The image of an object is magnified through at least one lens in the microscope. This lens bends light toward the eye and makes an object appear larger than it actually is.

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While some older microscopes had only one lens, modern microscopes make use of multiple lenses to enlarge an image. There are two sets of lenses in both the compound microscope and the dissecting microscope (also called the stereo microscope). Both of these microscopes have an objective lens, which is closer to the object, and an eyepiece, which is the lens you look through. The eyepiece lens typically magnifies an object to appear ten times its actual size, while the magnification of the objective lens can vary. Compound microscopes can have up to four objective lenses of different magnifications, and the microscope can be adjusted to choose the magnification that best suits the viewer’s needs. The total magnification that a certain combination of lenses provides is determined by multiplying the magnifications of the eyepiece and the objective lens being used. For example, if both the eyepiece and the objective lens magnify an object ten times, the object would appear one hundred times larger.

Health Canada published changes to the Radiation Emitting Devices Regulations (Laser Products) in Canada Gazette, Part II, on October 9, 2024. Learn more at: New requirements for laser products: Notice.

The label may provide information about the emission duration (time between pulses) or tell the user if the laser beam is visible or invisible.

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Though modern microscopes can be high-tech, microscopes have existed for centuries – this brass optical microscope dates to 1870, and was made in Munich, Germany.

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