Practice question

**Compound microscope** M = m_o × M_e, objective magnification m_o = v_o/u_o ≈ L/f_o, L tube length, eyepiece M_e = 1+D/f_e (image at D) or D/f_e (infinity). Objective forms real inverted magnified image at focal plane of eyepiece, eyepiece acts as simple microscope magnifying it. A reflecting telescope uses mirrors instead of lenses as the objective. Mirrors reflect all wavelengths of light uniformly, avoiding the wavelength-dependent refraction that causes chromatic aberration in lenses, resulting in a clearer, color-corrected image. Substituting values gives Due to uniform reflection of all wavelengths, which matches expected image position and magnification from mirror/lens formula 1/f = 1/v - 1/u (lens)