Question

Match List-I with List-II
List-I (Component of microscope):
(A). Turret in a microscope
(B). Condenser in a microscope
(C). Arm of a microscope
(D). Ocular lens
List-II (Description):
(I). Lever beneath the opening in the stage consists of a shutter-like group of metal leaves which regulate the amount of light coming through the slide on the stage
(II). Revolving plate which bears the objective lens, attached at the lower end of the tube, can be turned to change the objective lens
(III). Short metal tube that contains a lens that fits into the top of the tube
(IV). Nearly C-shaped pillar arising from the base that supports the stage and ocular components

• (A) - (I), (B) - (II), (C) - (III), (D) - (IV)
• (A) - (II), (B) - (I), (C) - (IV), (D) - (III)
• (A) - (I), (B) - (II), (C) - (IV), (D) - (III)
• (A) - (II), (B) - (III), (C) - (I), (D) - (IV)

Hint:

Remember that the ocular lens is the eyepiece at the top (top of the tube), while the revolving turret holds the objectives at the bottom.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
An optical microscope consists of structural, light-focusing, and magnifying components.
Understanding the exact role of each mechanical and optical part is fundamental to microscopy.

Step 2: Detailed Explanation:
Let us analyze each component and pair it with its structural description:
(A) Turret (or revolving nosepiece):
The turret is the revolving circular plate located at the lower end of the microscope body tube.
It holds multiple objective lenses of varying magnification and can be rotated to switch objectives.
Thus, (A) matches with (II).
(B) Condenser assembly Iris diaphragm:
The condenser concentrates and focuses light from the light source onto the specimen.
Directly beneath it is the iris diaphragm, which is a lever-operated shutter made of overlapping metal leaves that adjusts the diameter of the light beam.
Thus, (B) matches with (I).
(C) Arm of a microscope:
The arm is the rigid, curved (C-shaped) metal pillar that connects the base to the body tube.
It provides support for the stage, focus adjustments, and optical components, and serves as a handle for carrying the microscope.
Thus, (C) matches with (IV).
(D) Ocular lens (eyepiece):
The ocular lens is located inside a short cylinder at the very top of the microscope tube.
It provides secondary magnification of the image produced by the objective lens.
Thus, (D) matches with (III).
This pairing results in: (A) - (II), (B) - (I), (C) - (IV), (D) - (III).

Step 3: Final Answer:
The correct option is (B).