C HAPTER . v = – cm. The image is real, inverted and magnified. The size of the image is .
cm. As u f , v ; for u < f, image is virtual. . v = .
cm. Magnification = / , i.e., the size of the image is . cm. As u ; v f (but never beyond) while m .
n ga = . ; n wa = . ; n gw = . ; which gives sin r = .
. c i , where r is the radius (in m) of the largest circle from which light comes out and i c is the critical angle for water-air interface, Area = . m . n .
and D m for prism in water 10º . R = cm . Here the object is virtual and the image is real. u = + cm (object on right; virtual) (a) f = + cm.
Image is real and at . cm from the lens on its right side. (b) f = – cm. Image is real and at cm from the lens on its right side.
. v = . cm, image is erect and virtual. It is diminished to a size .
cm. As u , v f (but never beyond f while m ). Note that when the object is placed at the focus of the concave lens ( cm), the image is located at . cm (not at infinity as one might wrongly think).
. A diverging lens of focal length cm . (a) v e = – cm and f e = . cm give u e = – cm; v O = ( – ) cm = cm, f O = u O = – .
cm; Magnifying power = (b) u O = – . cm. Magnifying power = . .
. Angular magnification of the eye-piece for image at cm . ; | | . cm 27cm e u ; v O = .
cm Separation = . cm; Magnifying power =