Light of Wavelength $\lambda$ Is Normally Incident on Some Plane Optical Device

question 10

Multiple Choice

Light of wavelength $\lambda$ is normally incident on some plane optical device. The intensity pattern shown is observed on a distant screen ( $\theta$ is the angle measured to the normal of the device) . The device could be:

• A) a single slit of width W
• B) a single slit of width 2W
• C) two narrow slits with separation W
• D) two narrow slits with separation 2W
• E) a diffraction grating with slit separation W

---

Definitions:

Type II Error

The failure to reject a false null hypothesis or a false negative in hypothesis testing.

Significance Level

The significance level, denoted by alpha, is the threshold chosen by researchers below which a p-value must fall for results to be considered statistically significant.

Null Hypothesis

A statistical hypothesis that asserts there is no effect or no difference, and any observed deviation from this hypothesis is due to random variation.

Type II Error

A statistical error occurring when the null hypothesis is not rejected when it actually is false.