Photochromic glass is known for its ability to change color under the effect of light. This phenomenon, called reversible photochromism, is already used in eyeglass lenses that darken ... These ...

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Thanks to the internet, it’s easy to browse, customize and (virtually) try on prescription glasses online without taking a trip to the optometrist’s office. After evaluating several options ...

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\(power \ of \ a \ lens \ (D) = \frac{1}{focal \ length \ (m)}\) A lens has a power of -3.33 dioptres. Calculate the focal length and state what type of lens it is.