From the figure provided, how many images of the ball are visible in the mirrors if two plane mirrors form a right angle? 1 4 3 2

To determine the number of images visible in a scenario where two plane mirrors form a right angle, we can follow a systematic approach.

1. Break Down the Problem

• Recognize that two plane mirrors at a right angle (90 degrees) will create images of any object placed between them.
• We need to find how many distinct images of the ball can be formed due to the reflections in the mirrors.

2. Relevant Concepts

• The formula for the number of images (I) formed by two mirrors at an angle (θ) is given by: $I = \frac{360}{\theta} - 1$
• In this case, since the mirrors are at a right angle, θ = 90°.

3. Analysis and Detail

• Substituting θ = 90 into the formula: $I = \frac{360}{90} - 1 = 4 - 1 = 3$

4. Verify and Summarize

• The calculations indicate that three images should be formed.
• We verify that each mirror reflects the ball, which creates multiple reflections leading to a total of three visible images.

Final Answer

Therefore, the final result is 3.