Nonreflective Coatings for Camera Lenses Reduce the Loss of Light

question 15

Short Answer

Nonreflective coatings for camera lenses reduce the loss of light at various surfaces of multi-lens systems, as well as preventing internal reflections that might mar the image. Find the minimum thickness of a layer of magnesium fluoride (n = 1.38) on flint glass (n = 1.66) that will cause destructive interference of reflected light of wavelength λ = 550 nm, a wavelength which is near the middle of the visual spectrum.

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Definitions:

Weathering

The process by which rocks are broken down or chemically altered by external conditions on the Earth’s surface, including factors like wind, rain, and temperature changes.

Rotational Slide

A type of landslide that occurs along a curved surface, causing the land mass to rotate outward from the slope.

Debris Flow

A rapid downhill movement of a mixture of water, rock, soil, and organic matter, often triggered by heavy rain.

Rock Avalanche

A rapid, massive descent of rock debris and soil down a slope, often without a clear water component.