Two Flat Glass Plates Are in Contact Along One End

question 21

Multiple Choice

Two flat glass plates are in contact along one end and are separated by a sheet of paper 4.0 x 10^-6 m thick at the other end.The top plate is illuminated by a monochromatic light source of wavelength 490 nm.How many dark parallel bands will be evident across the top plate? (1 nm = 10^-9 m)

• A)7
• B)9
• C)13
• D)17

---

Definitions:

Demand

The desire to purchase goods and services backed by the ability and willingness to pay a certain price.

Supply

The total amount of a specific good or service that is available to consumers at a given time.

Usury Law

Legislation that imposes a maximum interest rate creditors can charge borrowers to protect consumers from excessively high rates.

Quantity

The amount or number of a material or immaterial thing not usually estimated by spatial measurement.