Asked by Hailey Huebner on Jul 31, 2024
Verified
When first focusing a microscope on a specimen, which objective lens should always be used first?
A) Low-power
B) Scanning
C) Oil immersion
D) High-power
E) It does not matter; any objective lens can be used first.
Objective Lens
is the lens closest to the object being observed in a microscope, which magnifies the image of the specimen.
Oil Immersion
A microscopy technique that involves placing a drop of oil on a slide to increase the resolution of the microscope by reducing light refraction.
Low-Power
Typically refers to a setting or mode of operation in devices that consume minimal electrical energy or to optical devices (like microscopes) using objective lenses with lower magnification.
- Master the underlying principles of magnification, improving the visibility of specimens, and approaches to focusing.
Verified Answer
PT
Pham Thi Kim Cuong B1707734Aug 06, 2024
Final Answer :
B
Explanation :
The scanning objective lens (usually the lowest magnification lens) is used first when focusing on a specimen with a microscope. This is because it has the longest working distance, reducing the risk of damaging the slide or lens, and it makes it easier to locate and center the specimen before switching to higher magnifications.
Learning Objectives
- Master the underlying principles of magnification, improving the visibility of specimens, and approaches to focusing.