Which of the following produces virtual image :

Options

A. Simple microscope
B. Ordinary camera
C. Projector
D. Cinemascope

Explanation

To solve the question of which optical device produces a virtual image, we can analyze each option based on the principles of optics.

### Step-by-Step Solution:

1. **Understanding Image Formation**:
- An image can be either real or virtual. A real image can be projected onto a screen, while a virtual image cannot be projected and is typically seen through the optical device.

2. **Analyzing Each Option**:
- **Simple Microscope**:
- A simple microscope (or magnifying glass) is used to view small objects. When the object is placed between the optical center (O) and the focal point (F) of the lens, it produces a virtual image. This image is upright and enlarged.
- **Ordinary Camera**:
- An ordinary camera uses a converging lens to focus light from an object onto a film or sensor. This results in a real image that can be captured and projected onto a screen.
- **Projector**:
- A projector also uses a lens system to project an image onto a screen. The image formed is real and can be displayed on a surface.
- **Cinemascope**:
- A cinemascope is a type of projector that creates a wide-screen image. Like the ordinary camera and projector, it produces a real image.

3. **Conclusion**:
- Among the options provided, the **simple microscope** is the only device that produces a virtual image. The other three devices (ordinary camera, projector, and cinemascope) produce real images.

### Final Answer:
The device that produces a virtual image is the **simple microscope**.