HC Verma Class 11 Physics Solutions Chapter 22: Photometry

HC Verma Solutions of Concept of Physics Part 1 Chapter -22 Photometry

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HC Verma Class 11 Physics Solutions Chapter 22: Photometry PDF

This page has detailed, step-by-step explanations of every question in HC Verma Class 11 Physics Solutions Chapter 22. For example, in the chapter “Photometry ” which is the first chapter of Volume 1 of HC Verma’s concept of physics for jee, all of the questions are solved and the steps are explained to help you learn. Utopper is a smart way for students to go over the whole Physics Syllabus again and again. The questions and answers help them study in a way that will help them do well on their tests.

In the HC Verma Class 11 Physics Solutions Chapter 22 “Photometry” concept of physics, all of the questions are solved and the steps are explained to help you learn. On the Utopper website where students can get free Reference Book Solutions and other study materials like Revision notes, Sample papers, and Important Questions. Science will be easier to learn if you have access to HC Verma Solutions and solutions for other courses.

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Here is a pdf of HC Verma Class 11 Solutions for Chapter 22: Photometry

HC Verma Class 11 Physics Solutions Chapter 22

About the chapter: HC Verma Class 11 Solutions Chapter 22

The word “photometry” comes from two Greek words that mean something to measure with light: “photos” and “merry.” Photometry is about measuring light, so that’s what it means. It is the study of how to measure how bright light is. Light’s ability to be measured quantitatively is very important in many areas of physics, astronomy, and technology. In the past, photometry was done by looking directly at objects and seeing how the eyes reacted to different levels of brightness.

It helped people tell the difference between different light sources, but it didn’t tell them how much light they gave off. Camille Chevreul, a French physicist, came up with a law in 1838 that says the brightness or feeling of sight is equal to 1/6th the power of the intensity of stimuli. This made the scientists want to do more research in this area, and in 1874, J. W. von Bezold lined the room of a dark box with silver that had been blackened. He made a small hole in the middle of this box, which is how he got regular candlelight to shine through. The name of this tool was “Bezold’s Lumimeter.”

So, photometry is the science of measuring the amount of light using instruments that can measure different aspects of light. These things are:

  • Luminous intensity is the amount of power that a light source gives off. The candela is the SI unit for how bright something is (cd).
  • Luminous flux: It is the total amount of power that a light source sends out in all directions. The SI unit for light is the lumen (lm).
  • Luminous emittance: It is the amount of power that a light source sends in a certain direction. The SI unit for light output is the lux (lx).
  • Radiance is the amount of power that a light source gives off per unit solid angle in all directions. Radiance is measured in watts per steradian (W sr).
  • Illuminance is the power of flux per unit area that hits a surface. The SI unit of brightness is the lux (lx).
  • Luminous intensity and Illumination: There is a close relationship between luminous intensity and illumination.

They depend on the type and position of the surface that scatters light, as well as the intensity and wavelength of the light. For example, a 1-cm-wide candle flame gives off more light on a surface that is perpendicular to its axis than on a surface that is 45° to the axis. This is because as the candle flame tilts away from the horizontal plane, it spreads out over a larger area. 

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