Understanding Numerical Aperture in Microscopy

What is the primary role of numerical aperture in microscopy?

• To limit resolution and brightness of the image

• To adjust the color of the image

• To change the size of the specimen

• To increase the magnification of the lens

How is numerical aperture (NA) mathematically defined?

• NA = n / theta

• NA = n + theta

• NA = n - sin(theta)

• NA = n * sin(theta)

Why is immersion oil used in microscopy?

• To decrease the brightness of the image

• To change the color of the specimen

• To minimize refraction and enhance NA

• To increase the magnification

What happens if you use immersion oil with a dry objective lens?

• The image becomes more colorful

• The image quality worsens

• The image quality remains the same

• The image quality improves

How does a higher numerical aperture affect image brightness?

• It increases the brightness

• It makes the image darker

• It has no effect on brightness

• It decreases the brightness