Question

The strength of magnification of oil immersion lens is

• A. $20\times$
• B. $500\times$
• C. $1000\times$
• D. $100\times$

Answer 1

Answer: (D)

$100\times$

There are three types of objective lens: 10X (low power objective lens); 40X (high power objective lens) and 100X (oil immersion objective lens). Each objective lens is represented by a particular colour. Oil immersion is the technique used to increase the resolving power of the microscope. In this technique, oil is used to avoid the different refractive index of air and glass which affect the numerical aperture.