Question

A student has to focus his compound microscope to observe a prepared slide showing different stages of binary fission in Amoeba . The step he is likely to follow are listed below in a haphazard manner:-
I. Adjusted the diaphragm and the mirror of the microscope so that sufficient – light-may enter to illuminate the slide
II. Fixed the slide on the stage carefully
III. Adjust the microscope to high power and focus
IV. Adjust the microscope to low power and focus the correct sequence of the above steps to observe the slide under the microscope is

(A) I,II,IV.III
(B) II,I,IV,III
(C) II,IV,I,III
(D) I,IV,II,III

Answer 1

Hint : Objects that are not in direct line of sight can be viewed by optical instruments named “periscope “ periscope help a lot for navigation under water and are of great help to submariners.
Simple periscopes require only mirrors , but periscopes that are a little more complex . Use prisms instead of mirror submarines use the complex periscope that requires take up to 10meter in length for a greater range of sight. Recently , developments in science & resistors have led up to the use of fiber optics in periscope.

Complete step-wise solution:
Correct sequences of the above steps to observe the side under the microscope II,I,IV,III
Adjust the diaphragm and the mirror of the microscope so that sufficient light may enter to illuminate the slide
Fix the slide on the stage carefully
Adjust the microscope to high power and focus in conclusion.
Adjust the microscope to low power and focus.

Note:
Kaleidoscope comes from greek word meaning “beautiful” from which to see Kaleidoscope is a device that consists of a tube containing a piece of mirror and colored glass or paper whose function produces a changing pattern when the tube is rotated.
“Human eye” is the organ of vision of the human body that enables us to see the human eye are located in the specialized socket carried out in the human pull the normal human eye size for approximately 2.5cm in diameter the main part of a human eye are:
Sclera
Cornea
Iris
Pupil
By using diaphragm concepts we have come out the conclusion of the answer.