Question

Which optical instrument is used to see very small objects that are not visible to the naked eye?

Hint:

This instrument uses a combination of lenses to magnify tiny objects like cells, not distant objects like stars.

Answer 1

Step 1: An object that is too small to be seen by the unaided eye needs its image magnified before it can be observed.

Step 2: A microscope is built using a system of converging lenses, an objective lens near the object and an eyepiece lens near the eye.

Step 3: The objective lens forms a real, enlarged image of the tiny object. The eyepiece then acts like a magnifying glass and further enlarges this image for the eye to see.

Step 4: Because of this two stage magnification, a microscope can make objects like cells and bacteria, which are far too small for the naked eye, appear large and clear.

Answer: The instrument used to see small objects is the microscope.