Question

What is the correct arrangement of lenses from the eye to the source of light in a light microscope?

• A. Ocular lens : Objective lens : Condenser lens
• B. Objective lens : Ocular lens : Condenser lens
• C. Condenser lens : Objective lens : Ocular lens
• D. Objective lens : Condenser lens : Ocular lens

Hint:

Trace lenses starting at the eyepiece and ending at the lamp under the stage.

Answer 1

The Correct Option is A

Step 1: In a compound light microscope the path of light runs from the light source, up through the specimen, and finally into the observer's eye. The question asks for the order of lenses moving from the eye back toward the light source.

Step 2: Starting at the eye, the first lens met is the ocular lens (eyepiece). Next comes the objective lens, which sits close to the specimen. Below the stage, nearest the light source, lies the condenser lens, which focuses the illuminating beam onto the specimen.

Step 3: Hence the sequence from eye to light is Ocular lens, then Objective lens, then Condenser lens, matching option a. The other options misplace the objective or condenser and therefore reverse the true optical layout.