True North Prepping
Magnifying Glass Card Fire Starter Multi Tools Pockets Survival Outdoor Camping Solar Igniter Travel Kits Fresnel Condenser Read
Magnifying Glass Card Fire Starter Multi Tools Pockets Survival Outdoor Camping Solar Igniter Travel Kits Fresnel Condenser Read
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SPECIFICATIONS
Brand Name: NoEnName_Null
Origin: Mainland China
Type: Pocket, Multi Tools
Size: S
Can the magnifying glass ignite?: tolerable
Can I use a magnifying glass to light a fire when camping outdoors?: tolerable
Is the ignition device convenient to carry?: Pocket size, convenient.
Can the igniter be read as a magnifying glass?: tolerable
Can Fresnel solar magnifying glass take fire?: The environment is acceptable
Choice: yes
semi_Choice: yes
Product attributes:
Product Name: Fresnel lens
Product list: Fresnel lens * 1, storage cover * 1
Important note， you must read it before buying
Taking fire with Fresnel lens has high requirements for weather, temperature and igniter. When taking fire in the field, the effect of the lens is far less than that of the flint, and its practicability is poor. It is suitable for physics teaching and expansion activities. Please wear sunglasses when using it to avoid looking directly at the strong light for a long time.
Weather on the day of shooting: sunny, temperature 30 ℃
Fresnel lens characteristics
The front of Fresnel lens is a circle of concentric circles, and the back is a smooth surface, with a thickness of 1.8mm, and the thickness of the edge is the same as that of the center
(different from convex lens)
What is focal length?
The straight-line light (sunlight) is focused to form a spot after passing through the lens. When the spot is the smallest, the straight-line distance between the center of the lens and the spot is the focal length.
Instructions
During operation, the concentric side (non smooth side) of the lens faces the sun, or the side marked with "up" faces the sun.
