Which of the following is/are the application of dip-coating? Plate glass Optical coating on bulbs Solar energy control system All of these

Breaking Down the Problem

1. Identify the options provided:
   • Plate glass
   • Optical coating on bulbs
   • Solar energy control system
   • All of these
2. Analyze whether each option is a valid application of dip-coating.

Relevant Concepts

Dip-coating is a process used to apply a coating to a substrate by immersing it into a solution and then withdrawing it, allowing a thin film to form due to the depletion of the solution on the surface. It is commonly used in various industries for:

• Glass coatings for various properties (like anti-reflective or anti-fog)
• Optical components for improved performance
• Coatings that enhance solar energy efficiency

Analysis and Detail

1. Plate Glass: Dip-coating is often used in the production of plate glass to enhance its properties, making it a valid application.
2. Optical Coating on Bulbs: This process also applies in creating optical coatings on bulbs to improve light transmission and reduce glare, confirming it is valid.
3. Solar Energy Control System: In solar applications, dip-coating can be used to apply coatings that improve the efficiency of solar panels, making this a relevant application as well.
4. All of These: Since all the individual applications listed are valid, this option is also correct.

Verify and Summarize

Each individual option is indeed a legitimate application of dip-coating. Therefore, selecting "All of these" encompasses all the valid applications listed.

Final Answer

The correct choice is All of these.