A compound microscope is an optical instrument used to view very small objects.

Question

A compound microscope is an optical instrument used to view very small objects. The simplest compound microscope is a system consisting of two lenses. The first lens, the objective, must create a slightly enlarged, inverted, real image of a small object. The second lens, the eyepiece, then takes this image and greatly enlarges it. Which of the following statements is correct about this type of compound microscope? The objective lens may be either concave or convex, but the eyepiece must be concave. The objective lens may be either concave or convex, but the eyepiece must be convex. The objective lens and the eyepiece are both concave lenses. The objective lens is a concave lens while the eyepiece is a convex lens. The objective lens is a convex lens while the eyepiece is a concave lens. The objective lens and the eyepiece are both convex lenses.

Explanation / Answer

The objective lens and the eyepiece are both convex lens. Because since the objective must create a highly enlarged, inverted and real image, only convex lens can do this as concave lens form virtual image and diminished in size. The eyepiece again enlarges the image so the eyepiece has to be convex lens.

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