HC Verma Solutions Class 11 Chapter 22 - Photometry

• The solutions are provided by expert Physics teachers, who have a deep understanding of the concepts in the chapter.

• The solutions cover all of the exercises in the chapter, so students can practice solving problems in a variety of contexts.

• The solutions are available in a free PDF, so students can access them anytime, anywhere.

• The given PDF provides a clear and concise explanation of the solutions to the exercises.

About HC Verma Class 11 Solutions For Chapter 22 - Photometry

The word "Photometry" comes from two Greek words, namely "photo" and "metry," which denote something to measure with light. The meaning is that photometry deals with measuring light. It is the science of measuring the intensity of light.

Quantitative measurement of light has great importance in various fields of physics, astronomy, and technology. The early photometry was done by direct inspection of objects with eyes visibly responding to different intensities.

It helped the persons to distinguish between different luminous sources, but it did not provide information about how much light they emitted. In 1838, the French physicist A Camille Chevreul developed a law that defines that brightness or sensation of vision is proportional to 1/6th power of intensity of stimuli. This stimulated the scientists towards further development in this field, and J W von Bezold (1874) placed a blackened silver lining the room of a dark box. He introduced a small hole in the center of this box with which he obtained standard candlelight. This device was named "Bezold's Lumimeter." 

Thus, photometry deals with the quantitative measurement of light using some suitable instruments capable of measuring various parameters of light. These are:-

• Luminous intensity: It is the power emitted by a light source in particular. The SI unit of luminous intensity is the candela (cd).

• Luminous flux: It is the total power emitted by a light source in all directions. The SI unit of luminous flux is lumen (lm).

• Luminous emittance: It is the power emitted by a light source in a particular direction. The SI unit of luminous emittance is lux (lx).

• Radiance: It is the total power emitted per unit solid angle by a light source in all directions. The SI unit of radiance is watt per steradian (W sr). 

• Illuminance: It is the power of flux incident on a surface per unit area. The SI unit of illuminance is lux(lx). 

Luminous intensity and Illumination: Luminous intensity and illumination are closely related to each other. They depend upon the nature and position of diffusing surface, intensity, and wavelength of light. For example, a candle flame about 1 cm in diameter emits more illumination on a surface perpendicular to its axis as compared to another placed at 45° to the axis. This is because the candle flame spreads over a larger area as it becomes inclined with respect to the horizontal plane.

HC Verma Volume 1 Solutions Other Chapters:

To make the most of the HC Verma Chapter 22 - Photometry Solutions, Vedantu recommends following these tips:

Begin by thoroughly reading the chapter: Ensure that you grasp the fundamental concepts and terminology before delving into the solutions.

Work through the examples step-by-step: Instead of simply memorizing the solutions, strive to understand the logic and reasoning behind each step.

Attempt the illustrative exercises independently: Challenge yourself to solve the problems on your own first. If you encounter difficulties, you can refer to the solutions for guidance, but attempting them independently enhances your problem-solving skills.

Practice, practice, practice! Remember, the more you practice solving physics problems, the more proficient you will become.

Take advantage of Vedantu's free Class 11 HC Verma Solutions for Chapter 22 - Photometry and embark on an efficient and flexible study routine. With these solutions by your side, you can confidently revise and practice physics concepts, paving the way for academic success.

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