CHAPTER 9

CHAPTER . 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 .

nga = . ; nwa = . ; ngw = . ; which gives sin r = .

. ci , where r is the radius (in m) of the largest circle from which light comes out and ic is the critical angle for water-air interface, Area = . m2 . n .

and Dm 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) ve = – cm and fe = . cm give ue = – cm; vO = ( – ) cm = cm, fO = uO = – .

cm; Magnifying power = (b) uO = – . cm. Magnifying power = . .

. Angular magnification of the eye-piece for image at cm . ; | | . cm 27cm e u ; vO = .

cm Separation = . cm; Magnifying power =