Physics – Formulae Sheet
(9). For achromatic combination of two lens
1 2 0 f1 f2
A m sin 2 (10). Refractive index of material of prism A sin 2
(m ) Minimum deviation angle
(11). For small-angled prism d ( 1)A (where A= Angle of prism and B= Deviation angle) (12). Dispersive power of prism for two colors (blue and red)
R v R v d 1 (13). For simple microscope, (a) Magnification m 1
(b) M
D f
(Where D= Least distance of distinct vision. and f= Focal length)
D for image to form at infinity f
(14). For compound microscope. Magnification of objective MO
(a) m mome
(b) m
vO uO
and Magnification of eye piece Me 1
vo D 1 for least distance of distinct vision. ue fe
L D for image to form at infinite. fo fe
(15). Magnifying power of telescope m
fo fe
and
35
length of telescope L fe fo
ve fe