Two Flat Glass Plates Are in Contact Along One End

question 18

Multiple Choice

Two flat glass plates are in contact along one end and are separated by a sheet of tissue paper at the other end.A monochromatic source of wavelength 490 nm illuminates the top plate.If 20 dark bands are counted across the top plate,what is the paper thickness? (1 nm = 10−⁹ m) Note that a dark band occurs where the plates contact.

• A) 2.7 × 10−⁶ m
• B) 3.4 × 10−⁶ m
• C) 4.7 × 10−⁶ m
• D) 4.9 × 10−⁶ m

---

Definitions:

Items

Refers to individual products or services that a company sells or the individual entries that make up a list or collection.

Intangible Assets

Non-physical assets owned by a business, such as patents, trademarks, goodwill, and copyrights, that have economic value and can provide future benefits.

Amortized

The gradual reduction of a debt or the spreading of capital expenses over a period of time.

Research and Development Costs

Expenses associated with the research and development of a company's goods or services, aiming to improve and innovate.