What is the total base up prism in the lens if it has 2D base up and 5.00 prism D auxiliary prism positioned base down?

To determine the total base up prism in the lens, you need to consider both the main prism value and the auxiliary prism's orientation and effect. When you have a primary prism of 2 degrees base up and an auxiliary prism of 5 degrees base down, you will need to account for these orientations to find the total prism effect.

Base up prisms diverge light upwards, while base down prisms converge light downwards. Since the auxiliary prism is base down, it has an opposing effect to that of the base up prism. To find the net effect, you subtract the base down prism from the base up prism:

Total prism = Base up prism - Base down prism

= 2D (base up) - 5D (base down)

Performing this operation, we take the magnitude of the base down as opposing the base up gives:

Total = 2 - 5 = -3D

A negative result indicates that instead of a net base up effect, the lens ends up with a base down effect. However, the total amount of prism strength is still crucial to consider. The absolute value is essential when gauging the total prism present in question.

In this scenario, it is vital to also recognize that if