In the normal use of a simple microscope, a person sees an

1. Analyze the question We are asked about the type of image seen when using a simple microscope (a single converging lens used as a magnifying glass).

2. Explain the concept A simple microscope is one converging (convex) lens with a short focal length. For it to magnify, the object must be placed between the lens and its principal focus (u < f).

When an object is inside the focal length of a convex lens:

• The refracted rays diverge, so they never actually meet on the other side of the lens.
• The eye traces these rays backwards and sees them appear to come from a point on the same side as the object.
• This gives a virtual image, which cannot be caught on a screen.
• The image is erect (the same way up as the object).
• The image is magnified and farther from the lens than the object.

3. Step-by-step solution Using the lens formula 1/f = 1/u + 1/v (real-is-positive convention):

• Take f = 10 cm and u = 4 cm (u < f).
• 1/v = 1/f − 1/u = 1/10 − 1/4 = (2 − 5)/20 = −3/20
• v = −6.67 cm

The negative sign means the image is virtual.

Magnification: m = v/u = 6.67/4 ≈ 1.67 (the image is bigger than the object). It is positive, so the image is erect.

4. Check the options

• A. Erect, real, magnified: wrong, an erect image from a single lens is never real.
• B. Erect, virtual, magnified: correct.
• C. Inverted, virtual, magnified: wrong, the virtual image here is not inverted.
• D. Inverted, real, magnified: this describes a projector or the objective lens of a compound microscope, not a simple microscope.
• E. Inverted, real, same size: this happens when u = 2f, not in a magnifying glass.

5. Exam tip Remember: "Magnifying glass = object inside f = Virtual, Erect, Magnified." A real image can be projected onto a screen, while a virtual image can only be seen by looking through the lens. For any single convex lens, if the image is erect, it must be virtual.