Chapter 7, Problem 4A

Summary Introduction

Introduction : 

A microscope is a type of scientific instrument used in laboratories to visualize microscopic organisms not visible to naked eyes. Microscopes are of different types but the simplest of all and most commonly used one is the light microscope. It uses a source of light to illuminate objects along with a combination of lenses to magnify the object.

Answer to Problem 4A

Correct answer : 

The correct answer is option (d) 175x.

Explanation of Solution

Explanation/justification for the correct answer :

Option (d) 175x. The total magnification of an object done by a set of lenses in a light microscope is the multiplicative effect of individual magnification of all the lenses. Therefore, the total magnification of this microscope can be calculated as:

  

So, the correct answer is option (d).

Explanation for incorrect answer : 

Option (a) 25x. The calculated total magnification comes out to be 175x. Therefore, this is an incorrect option.

Option (b) 35x. The calculated total magnification comes out to be 175x. Therefore, this is an incorrect option.

Option (c) 17x. The calculated total magnification comes out to be 175x. Therefore, this is an incorrect option.