Question

Mirrors for astronomical instruments are invariably first-surface mirrors: The reflective coating is applied on the surface exposed to the incoming light. Household mirrors, on the other hand, are second-surface mirrors: The coating is applied to the back of the glass or plastic material of the mirror. (You can tell the difference by bringing the tip of an object

Name: Problem 28, Chapter 33: University Physics with Modern Physics
Uploaded: 2021-05-28T08:18:23-08:00
Duration: 1 min 44 s
Channel: Ajay Singhal
Description: Mirrors for astronomical instruments are invariably first-surface mirrors: The reflective coating is applied on the surface exposed to the incoming light. Household mirrors, on the other hand, are second-surface mirrors: The coating is applied to the back of the glass or plastic material of the mirror. (You can tell the difference by bringing the tip of an object

   Mirrors for astronomical instruments are invariably first-surface mirrors: The reflective coating is applied on the surface exposed to the incoming light. Household mirrors, on the other hand, are second-surface mirrors: The coating is applied to the back of the glass or plastic material of the mirror. (You can tell the difference by bringing the tip of an object

University Physics with Modern Physics

Wolfgang Bauer, Gary… 2nd Edition

Chapter 33, Problem 28

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Solved by Expert Ajay Singhal

05/28/2021

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In first-surface mirrors, the reflective coating is applied on the surface exposed to the incoming light. This is the type of mirror used in astronomical instruments. On the other hand, in second-surface mirrors, the coating is applied to the back of the glass or Show more…

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Mirrors for astronomical instruments are invariably first-surface mirrors: The reflective coating is applied on the surface exposed to the incoming light. Household mirrors, on the other hand, are second-surface mirrors: The coating is applied to the back of the glass or plastic material of the mirror. (You can tell the difference by bringing the tip of an object

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Key Concepts

Second-surface mirror

In these mirrors, the reflective coating is applied on the back of a transparent substrate. As light passes through the substrate before reflecting, it can introduce slight distortions, making second-surface mirrors less ideal for precision imaging but acceptable for everyday uses like household mirrors.

Reflective coating

A reflective coating is a thin layer, often metallic, applied to a substrate to enhance its ability to reflect light. The placement and properties of this coating are critical, as they determine how accurately and efficiently the mirror reflects light without unwanted distortions.

First-surface mirror

This type of mirror has its reflective coating applied directly to the front surface, where light first makes contact. The direct reflection minimizes optical distortions and double reflections, which is essential for applications requiring high precision, such as in astronomical instruments.

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