Question

Arrange different parts of microscope from Eyepiece onwards.
A. Focus knob
B. Specimen stage
C. Objectives
D. Condenser
E. Base with built-in light source
Choose the correct answer from the options given below :

• A. C, B, D, A, E
• B. B, C, A, D, E
• C. E, A, B, C, D
• D. E, B, C, A, D

Hint:

Trace the path of light in reverse! Light goes from Base \(\rightarrow\) Condenser \(\rightarrow\) Specimen Stage \(\rightarrow\) Objectives \(\rightarrow\) Eyepiece. The structural components essentially follow this optical path.

Answer 1

The Correct Option is A

Step 1: Concept:
The question asks us to sequentially trace the structural layout of a standard compound light microscope, starting top-down from the eyepiece (where the observer looks) toward the bottom.

Step 2: Step-by-step Explanation:

• Top (Starting point): The Eyepiece (Ocular lens) is at the very top.

• Next Level (C): Directly below the eyepiece and the body tube is the revolving nosepiece holding the Objectives (objective lenses). These are positioned directly over the specimen to magnify the image.

• Next Level (B): Right beneath the objective lenses is the Specimen stage (mechanical stage), the flat platform where the glass slide holding the specimen is placed.

• Next Level (D): Positioned immediately beneath an aperture in the specimen stage is the Condenser. Its role is to focus the incoming light cone directly onto the specimen.

• Next Level (A): Structurally on the arm of the microscope, extending downward toward the base, are the coarse and fine Focus knobs. They physically move the stage up and down. Structurally, they are located below the level of the stage/condenser.

• Bottom (E): At the very bottom of the entire apparatus is the Base with built-in light source (illuminator), resting on the table.

• Therefore, the logical top-to-bottom structural sequence is: Objectives (C) \(\rightarrow\) Stage (B) \(\rightarrow\) Condenser (D) \(\rightarrow\) Focus knob mechanism (A) \(\rightarrow\) Base (E).

Step 3: Final Answer:
The correct order is C, B, D, A, E, matching Option (A).