In which of the following the final image is erect? A) simple microscope B) compound microscope C) Astronomical telescope D) Galilean telescope

Options

A. simple microscope
B. compound microscope
C. Astronomical telescope
D. Galilean telescope

Answer

To determine which optical instrument produces an erect final image, we can analyze each option provided:

1. **Simple Microscope**:
- A simple microscope (magnifying glass) produces an erect image. When an object is placed within the focal length of the lens, the image formed is virtual and upright.

2. **Compound Microscope**:
- A compound microscope consists of two lenses: the objective lens and the eyepiece. The image formed by the objective lens is inverted, and when viewed through the eyepiece, the final image remains inverted. Thus, the final image is not erect.

3. **Astronomical Telescope**:
- An astronomical telescope typically produces an inverted image. The objective lens forms an inverted image, and the eyepiece magnifies this image, maintaining its inverted nature. Therefore, the final image is not erect.

4. **Galilean Telescope**:
- A Galilean telescope uses a convex lens as the objective and a concave lens as the eyepiece. This configuration produces an erect image. The final image seen through a Galilean telescope is upright.

Based on this analysis, we can conclude:

- The instruments that produce an erect final image are:
- **Simple Microscope** (Option A)
- **Galilean Telescope** (Option D)

However, since the question asks for "which of the following the final image is erect," and among the options, the most straightforward answer is:

**Answer: A) Simple Microscope**