Bright and Dark Fringes Are Seen on a Screen When $d = \frac { \lambda _ { \text {aiy } } } { 2 }$

question 15

Multiple Choice

Bright and dark fringes are seen on a screen when light from a single source reaches two narrow slits a short distance apart.The locations of bright and dark fringes can be interchanged if a thin film is placed in front of one of the slits.The minimum thickness of this film must be

• A) \(d = \frac { \lambda _ { \text {aiy } } } { 2 }\) .
• B) \(d = \frac { \lambda _ { \text {oir } } } { 2 n _ { \text {film } } }\) .
• C) \(d = \frac { \lambda _ { \text {oir } } } { \left( n _ { film } - 1 \right) }\) .
• D) \(d = \frac { \lambda _ { \text {air } } } { 2 \left( n _ { film } - 1 \right) }\) .
• E) \(d = \frac { \lambda _ { \text {air } } } { n _ { \text {film } } }\) .

---

Definitions:

Salvage Value

Salvage value is the estimated residual value of an asset at the end of its useful life, indicating what a company expects to recover or sell the asset for.

Depreciation Expense

The calculated apportionment of the price of a tangible asset over the duration it is useful.

Components

The individual parts or elements that make up a larger product, system, or machine.

Depreciated Separately

An accounting method in which assets are depreciated individually, based on their own useful life and depreciation rate, rather than being grouped together with other assets.