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).Quotient Rule: The log of a quotient is the difference of the logs (
Exponents and logarithms are two sides of the same coin. They undo each other. If you travel up a mountain using an exponent, the logarithm is the path back down to the base. This relationship is why we use logs to solve equations where the variable is trapped in the exponent. Applications in the Real World:
The Kingdom of Infinite Number: A Field Guide to Exponents and Logarithms
).Quotient Rule: The log of a quotient is the difference of the logs (
Exponents and logarithms are two sides of the same coin. They undo each other. If you travel up a mountain using an exponent, the logarithm is the path back down to the base. This relationship is why we use logs to solve equations where the variable is trapped in the exponent. Applications in the Real World:
The Kingdom of Infinite Number: A Field Guide to Exponents and Logarithms
*Discount applied on the current website price at the time of order. Offer only valid for new customer first contacts order over $10. Maximum discount of $100. Cannot be combined with any other offers. Promotions are subject to change without notice. We reserve the right to cancel orders that are in breach of the terms and conditions of this offer.
| Lens Width | Bridge Width | Temple Length | |
|---|---|---|---|
| XS | < 42 mm | < 16 mm | <=128 mm |
| S | 42 mm - 48 mm | 16 mm - 17 mm | 128 mm - 134 mm |
| M | 49 mm - 52 mm | 18 mm - 19 mm | 135 mm - 141 mm |
| L | >52 mm | >19 mm | >= 141 mm |
Buying eyewear should leave you happy and good-looking. Use our sizing tool to find frames that best fit your unique facial measurements.
Grab a regular card with a magnetic stripe on the back. Student IDs, credit cards and gift cards work well to start our online PD tool.
You may have received our paper PD measurement tool in your recent online order. In order to use this tool, place the ruler on your eyes so that the "0" lines up at the centre in between your eyes. Add up the two numbers, to get your PD. See example below:
Click on this link to download and print your own PD measurement tool.
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