Question

Which of the following statements are correct? 

• The three objective lenses we have in the lab have individual magnifications of 4x, 10x and 400x 

• If the total magnification is 400X and the ocular lens is 10x, then the objective lens used must be 400x. 

• Total magnification equals objective lens magnification times ocular lens magnification. 

• The fine adjustment knob is only used when the microscope is on the low or high power, that is you should only use the fine adjustment knob at magnifications of 100x and 400x or higher. 

• The fine adjustment knob can only used when the microscope is on the lowest total magnification (40x) 

Answer 1

1, 3, 4

First option is a correct fact about the three types of objective lenses present in a microscope.

Second option is incorrect because if the total magnification is 400 then the magnification of ocular lens will be 10 and that of objectives will be 40.

Third option is correct definition of total magnification.

Fourth option is correct. And fifth option is incorrect because coarse focus knob is used with low power magnification and fine focus knob is used with high power magnification.

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