Microscope is an optical instrument which

Options

A. enlarges the object
B. increases the visual angle formed by the object at the eye
C. decreases the visual angle formed by the object at the eye
D. brings the object nearer

Answer

To solve the question regarding the function of a microscope, we can break it down into several steps:

### Step 1: Understand the Function of a Microscope
A microscope is an optical instrument designed to magnify small objects, allowing us to see details that are not visible to the naked eye.

**Hint:** Consider what happens when you look through a microscope compared to looking at an object directly.

### Step 2: Identify the Components of a Microscope
A typical microscope consists of two main lenses: the objective lens and the eyepiece (ocular lens). The objective lens creates a magnified image of the object, and the eyepiece further magnifies this image for the viewer.

**Hint:** Remember the roles of the objective lens and eyepiece in magnification.

### Step 3: Visual Angle Concept
When an object is viewed through a microscope, it subtends a visual angle at the eye. The visual angle is the angle formed at the eye by the lines of sight to the top and bottom of the object. A larger visual angle means that the object appears larger.

**Hint:** Think about how the position of the eyepiece affects the angle at which you see the object.

### Step 4: Analyze the Options
The options provided are:
1. Enlarges an object
2. Increases the visual angle formed by the object
3. Decreases the visual angle formed by the object
4. Brings the object nearer

From our understanding, the microscope does not physically bring the object closer; instead, it increases the visual angle, making the object appear larger.

**Hint:** Eliminate options that contradict the basic function of a microscope.

### Step 5: Conclusion
Based on our analysis, the correct answer is that the microscope "increases the visual angle formed by the object." This allows the viewer to see a magnified image of the object.

**Final Answer:** The microscope is an optical instrument which increases the visual angle formed by the object.