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The value of the focal length of the lens is equal to the value of the image distance when rays are (A) Passing through optical center(B) Parallel to the principal axis.(C) Passing
Focal length, explained by RP Photonics Encyclopedia; focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius
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Focal length - Wikipedia
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What Is Focal Length in Photography?
Focal length, focusing distance, working distance | Borislav Kostov - photography and design
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Focal Length | Understanding Camera Zoom & Lens Focal Length | Nikon | Nikon
Focal Length | Understanding Camera Zoom & Lens Focal Length | Nikon | Nikon
What Is Focal Length in Photography?
Understanding Cameral Focal Length for the Best Results - The Darkroom
What Is Focal Length: Pro Guide To Using Camera Lenses • Filmmaking Lifestyle
