Optics

aberration angle of incidence angle of refraction apparent magnitude appear axes binocular parallax centre chromatic circular coincide colour consequently convergent power convex lens corresponding crystal curves diameter direction disc distance distant objects distinct vision diverging double refraction effect equal extraordinary pencil eye glass eye piece focal length foci greater humour illuminated inch incident ray index of refraction instrument intensity lenses less luminous magnifying power medium microscope motion moved object glass object piece observer optic axis parallel rays passing perception perpendicular phenomena picture placed plane of polarisation plate position principal focus prism produced proportion pupil radius reflected rays refracting power refrangibility rendered represented in fig retina right angles screen seen shown in fig space spectrum spherical spherical aberration spherical reflector suppose surface telescope tion tourmaline transmitted transparent tube vertical violet visual angle visual magnitude vitreous humour yellow