Chapter 4, Problem 1PL

The human eye cannot perceive objects less than

1. one inch.
2. one millimeter.
3. 0.1 millimeter.
4. one centimeter.

Summary Introduction

Introduction: The human eye is a sensory organ. It reacts with light and permits the light perception, depth perception and color vision. Magnification can be defined as the process of intensifying not physical size but the visible size, of something. This amplification is quantified by a calculated number. When this value is less than one then it is known as a reduction in size. It is known as the de-magnification or minification.

Answer to Problem 1PL

Correct answer: 

The correct answer is the option (c). 0.1 millimeter.

Explanation of Solution

Explanation/justification for the correct answer: 

Option (c). 0.1 millimeter. According to research, humans can see objects small as approximate 0.1 millimeters about the regular vision. It is exclusive of the help of any tools. The smallest things humans can see are human hair and lice with the help of their eyes. Both of these objects could be viewed with the naked eye and under a microscope. Hence, the option (c) is correct.

Explanation for the correct answer: 

Option (a) one inch. It can easily be seen with naked eyes as inch is a larger than a centimeter. Hence, the option (a) is incorrect. 

Option (b) one millimeter. It is the smallest unit in a centimeter. Hence, the option (b) is incorrect. 

Option (d) One centimeter. It consisite of 10 millimeter subunits. Hence, the option (d) is incorrect.

Conclusion

According to research, humans can see objects small as approximate 0.1 millimeters about the regular vision. It is exclusive of the help of any tools. Hence, the option (c) is correct.