Use Of Microscope Flashcards
- What is the primary purpose of a microscope?A) To observe large objectsB) To magnify images of objectsC) To reflect lightD) To capture images digitally
Answer: BExplanation: A microscope magnifies images of objects enabling detailed observation and analysis at a scale that would be impossible with the naked eye.
- Which of the following microscopes uses transmitted or reflected light?A) Electron microscopeB) Acoustic microscopeC) Optical microscopeD) Scanning tunneling microscope
Answer: CExplanation: Optical microscopes use light (transmitted or reflected) to produce images unlike electron microscopes that use electron beams.
- What type of lens does a simple microscope use?A) Objective lensB) Eyepiece lensC) Single or compound lensD) Condenser lens
Answer: CExplanation: A simple microscope like a magnifier or loupe typically uses a single or compound lens to magnify objects.
- In a compound microscope the objective lens is positioned:A) Close to the eyepieceB) Close to the object being examinedC) Below the condenserD) Above the light source
Answer: BExplanation: The objective lens in a compound microscope is placed close to the object to create a real image which is then magnified by the eyepiece.
- Which component in a compound microscope controls the amount of light entering the condenser?A) Objective lensB) Iris diaphragmC) Mechanical stageD) Fine adjustment knob
Answer: BExplanation: The iris diaphragm regulates light entering the condenser essential for controlling illumination on the specimen.
- What is the role of the condenser in a microscope?A) To magnify the specimenB) To support the microscope’s armC) To collect and direct light onto the slideD) To provide structural support
Answer: CExplanation: The condenser gathers light from the source and focuses it on the specimen ensuring even illumination.
- Which microscope allows each eye to view the object separately creating a 3D effect?A) Compound microscopeB) Stereoscopic microscopeC) Polarizing microscopeD) Metallographic microscope
Answer: BExplanation: Stereoscopic microscopes allow each eye to view the object separately giving a perception of depth and a 3D appearance.
- The type of microscope that uses an annular stop in its diaphragm is the:A) Compound microscopeB) Phase-contrast microscopeC) Polarizing microscopeD) Metallographic microscope
Answer: BExplanation: The phase-contrast microscope uses an annular stop in its diaphragm to enhance contrast for transparent unstained specimens.
- What feature is specific to polarizing microscopes?A) They magnify using sound wavesB) They have a phase plate for light diffusionC) They measure details of polarization effectsD) They are used only with live specimens
Answer: CExplanation: Polarizing microscopes are equipped to measure polarization effects often used to study crystals and detailed structures like bone.
- In microscopy what does ‘X’ symbolize?A) Resolving powerB) Magnifying powerC) Numerical apertureD) Virtual image
Answer: BExplanation: The symbol ‘X’ represents the magnification power of a lens indicating how many times larger the lens can make an object appear.
- What is the primary function of the objective lens in a compound microscope?A) To magnify the virtual imageB) To create a real image in front of the eyepieceC) To collect and direct light from the specimenD) To control the amount of light entering the microscope
Answer: BExplanation: The objective lens in a compound microscope forms a real image in front of the eyepiece which is then magnified by the eyepiece for viewing.
- Which of the following best describes the purpose of the condenser in a microscope?A) Controls magnification powerB) Focuses light onto the specimenC) Holds the slide in placeD) Houses the eyepiece
Answer: BExplanation: The condenser directs and focuses light from the microscope’s light source onto the specimen to ensure a clear image is formed.
- The phase-contrast microscope is primarily used to observe which type of structures?A) Thick opaque objectsB) Stained transparent structuresC) Unstained transparent structuresD) Very small objects like atoms
Answer: CExplanation: Phase-contrast microscopes are ideal for viewing unstained transparent structures such as living cells by enhancing contrast without needing stains.
- In a stereoscopic microscope why does the specimen appear three-dimensional?A) The lens magnifies the object from two anglesB) It uses two objective lenses and two eyepieces for separate imagesC) It has a higher magnification powerD) It uses a phase plate
Answer: BExplanation: A stereoscopic microscope provides a three-dimensional view by allowing each eye to see the specimen from a slightly different angle using two objective lenses and eyepieces.
- What characteristic enables polarizing microscopes to examine crystalline structures?A) Phase plate and annular stopB) Vertical illuminationC) Polarization effectsD) Adjustable iris diaphragm
Answer: CExplanation: Polarizing microscopes have features that permit detailed examination of crystals through their ability to analyze polarization effects.
