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#inverted image

2 public questions tagged with this topic.

Optical Instruments - Simple and Compound Microscope

Why does the image in a refracting telescope appear inverted without additional optics?

**Simple microscope** magnification M = 1 + D/f when image at D=25 cm near point, M = D/f when image at infinity (relaxed eye), f focal length (cm), D least distance of distinct vision 25 cm. For f=4 cm, image at 25 cm, M=1+25/4=7.25, angular magnification ratio of angle subtended by image to that by object at D. In a refracting telescope, the objective lens forms a real, inverted image of the distant object at its focal plane. The eyepiece magnifies this inverted image without reinverting it, so the final image remains inverted unless an additional lens or prism system is used. Substituting v

Ref: NCERT > Physics Book > Ray Optics > Optical Instruments - Simple and Compound Microscope

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Reflection by Spherical Mirrors and Mirror Formula

Why does the image formed by a convex lens become real and inverted when the object is moved beyond the focal point?

**Concave mirror image formation** depends on object position: beyond C real inverted diminished between F and C, at C real inverted same size at C, between C and F real inverted magnified beyond C, at F image at infinity, within F virtual erect magnified behind mirror. Beyond the focal point, a convex lens converges light rays to a point on the opposite side of the lens. This convergence forms a real image, and because the rays cross over, the image is inverted relative to the object’s orientation. Substituting values gives Due to convergence of rays on the opposite side, which matches expect

Ref: NCERT > Physics Book > Ray Optics > Reflection by Spherical Mirrors and Mirror Formula

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