Answer:
To calculate the length of the object when observed under the microscope, we can use the formula:
Length observed = Length actual / (Magnification of eyepiece × Magnification of objective)
Given that the length actual is 0.5 mm, the magnification of the eyepiece is 25, and the magnification of the objective is 0.5:
Length observed = 0.5 mm / (25 × 0.5)
Length observed = 0.5 mm / 12.5
Length observed = 0.04 mm
Therefore, when observed under the microscope, the object will appear to be 0.04 mm long.
Explanation: