What are some problems with having the tv remote background color as black?

Sydney wanted to color her hair from home so she signed up for an online service that sent hair color directly to her. The service required information about the thickness of Sydney's hair to mix the color properly. They only wanted to know if it was fine, medium, or thick, but being an astute student of physics, Sydney knew she could be more precise than that! She shone a red laser pointer with a wavelength of 670 nm through a single strand of hair and a diffraction pattern appeared on the wall 1.85 m away. a) Explain why this fringe pattern appears and how it confirms the wave nature of light. What would you predict the image on the screen to look like if light were a particle instead? b) What is the thickness of Sydney's strand of hair? Explain which formula is best to use here and why?

When a CD is held at an angle, the reflected light containsmany colors. What causes these colors?(a) An anti-theft encoding intended to prevent copying ofthe CD.(b) The different colors correspond to different data bits.(c) Light reflected from the closely spaced grooves addsconstructively for different wavelengths at differentangles.(d) It is part of the decorative label on the CD.

Two sheets of ideal polarizing material are placed with their transmission axes at 60.0 to each other. A third polarizing sheet is placed between them with its transmission axis at 30.0° to the axes of the other two. What is the fraction of the incident light intensity that is transmitted, when the middle sheet is removed? ___I0

In light microscopy, what effect does an Airy disk have on resolution?