Practice question

**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. A combination of lenses allows for greater magnification and improved image quality. The objective lens forms an initial image, which the eyepiece magnifies further, while multiple lenses can correct aberrations (e.g., chromatic, spherical), enhancing sharpness and clarity. Substituting values gives Increases magnification and corrects aberrations, which matches