Perceived size of an object by a person depends mainly on

Options

A. aperture of pupil of person
B. size of retina of the person
C. size of image formed on the retina of person
D. distance of object from eye

Explanation

To determine the perceived size of an object by a person, we need to analyze the factors that influence how we perceive the size of objects. Here’s a step-by-step solution:

### Step 1: Understanding Perceived Size
The perceived size of an object refers to how large or small an object appears to an observer. This perception can be influenced by various factors, including the physical characteristics of the observer's eyes and the conditions under which they are viewing the object.

### Step 2: Analyzing the Factors
1. **Aperture of the Pupil**:
- The pupil's size can change depending on the light conditions (dilating in low light and constricting in bright light). However, this does not affect the perceived size of the object directly; it only affects the intensity of light entering the eye.
- **Conclusion**: This factor does not significantly influence perceived size.

2. **Size of the Retina**:
- The retina is the part of the eye that receives light and forms images. However, the size of the retina varies among individuals and does not directly correlate with how we perceive the size of an object.
- **Conclusion**: This factor is not a primary determinant of perceived size.

3. **Size of the Image Formed on the Retina**:
- The size of the image formed on the retina is crucial. When an object is closer, the image on the retina is larger, leading the brain to interpret it as a larger object.
- **Conclusion**: This is a key factor in determining perceived size.

4. **Distance of the Object from the Eye**:
- While the distance of an object can influence how large it appears (closer objects appear larger), perceived size is more about the interpretation of the image formed on the retina rather than the actual distance alone.
- **Conclusion**: This factor is relevant but not the main determinant of perceived size.

### Step 3: Conclusion
The perceived size of an object by a person mainly depends on the **size of the image formed on the retina**. This image size is influenced by the object's distance from the observer, but the primary factor is how the brain interprets the size of the image on the retina.

### Final Answer
The perceived size of an object by a person depends mainly on the **size of the image formed on the retina**.

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