Which objective lens requires oil to be applied?
Multiple choice.
A.
4x
B.
10x
C.
40x
D.
100x
The correct answer is:
D. 100x
Explanation:
- D. 100x: The 100x objective lens is the one that requires oil, specifically immersion oil, to be applied. This is known as the oil immersion lens. The oil helps to reduce light refraction and increases the resolution and clarity of the image when using high magnification.
- A. 4x: This is a low-power objective lens and does not require oil.
- B. 10x: This is also a low to medium power objective lens and does not require oil.
- C. 40x: This is a high-power objective lens but typically does not require oil. It is used with air and is not an oil immersion lens.
Thus, the objective lens that requires oil to be applied is D. 100x.