Answer:
Using a light beam as a pointer to measure small deflections has several advantages:
1)High accuracy: A light beam can be very precisely focused, allowing for high accuracy in measuring small deflections.
2)Non-intrusive: A light beam can be used without physically touching or interfering with the object being measured, making it a non-intrusive method that does not affect the object's behavior or cause any damage.
3)High sensitivity: A light beam can detect even very small deflections, which can be difficult to measure with other methods.
4)Fast response: The light beam can provide an immediate response to changes in deflection, making it useful for measuring dynamic events.
5)Easy to use: The equipment required to generate and measure a light beam is relatively simple and easy to use, making it a cost-effective and accessible method for many applications.
Overall, the advantages of using a light beam as a pointer to measure small deflections include high accuracy, sensitivity, non-intrusiveness, fast response, and ease of use.