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A tank whose bottom is a mirror is filled with water to a depthof 19.1 cm. A small fish floats motionless 6.00 cm under thesurface of the water.

A flint glass plate (n = 1.66) rests on the bottom of an aquarium tank. The plate is 6.00 cm thick (vertical dimension) and covered with water (n = 1.33) to a depth of 11.9 cm. Calculate the apparent thickness of the plate as viewed from above the water. (Assume nearly normal incidence of light rays.)

Upon normal incidence, a light beam can pass through a glass plate (of refractive index 1.5) in 50 pico seconds (1ps= 10 -12 seconds) What is the thickness (in cm) of the glass plate?

A beam of light enters from air to glass. If the speed of light in air is 3 x 10^8 m/s and in glass is 2 x 10^8 m/s, calculate the refractive index of glass with respect to air.

Class-public speaking

Narratives in Ads and Charitable Appeals

Discuss how the speaker uses the narrative in their speech. Consider these questions:

•  What does the narrative add to the speech's content?

•  What point does the speaker use the narrative to make?

Now consider whether the speaker uses the narrative fairly.

•  Does the narrative's content relate closely to the speech's purpose?

•  Does the narrative seem to be true?

Finally, share a narrative you have seen or heard in a speech for a charitable event or in an ad that you think was used poorly. Perhaps it played unfairly on listeners' emotions or was out of synch with the rest of the content. Evaluate the use of the narrative with your classmates.

"How has the Internet affected culture?"

Present at least two detailed paragraphs answering this question. Think about the definition of culture and perhaps present specific examples of how the Internet has affected culture.