Two thin similar watch glass pieces are joimed together,front to front ,woth near convex portion silvered and the combination of glass pieces is placed at a distanc e`a=60cm` from a screen.A small object is placed normal to the optical axis of the combination such that its two water`mu=4//3`,calcuated the distance through,which the object must eb displayed so that a sharp image is again formed on the screen.

Two thin similar watch glass pieces are joined together,front to front ,with near convex portion silvered and the combination of glass pieces is placed at a distance a=60cm from a screen.A small object is placed normal to the optical axis of the combination such that its image is two time the object. Now water is filled in between the glass. water mu=4//3 ,calculated the distance through,which the object must be displayed so that a sharp image is again formed on the screen.

Two thin similar watch glass pieces are joined together,front to front ,with rear convex portion silvered and the combination of glass pieces is placed at a distance a=60cm from a screen.A small object is placed normal to the optical axis of the combination such that its image is two time the object. Now water is filled in between the glass. water mu=4//3 ,calculated the distance through,which the object must be displayed so that a sharp image is again formed on the screen.

A convex lens of focal length 20 cm is placed at a distance of 30 cm from a screen. Where should an object be placed so as to form its real image on the screen?

Two thin similar convex glass pieces are joined together front to front with its rear portion silvered such that a sharp image is formed 20 cm from the mirror. When the air between the glass pieces is replaced by water (mu_(w)=4//3) , then the image formed from the mirror is at a distance of

Two thin similar convex glass are joined together front to front, with its rear portion silvered such that a sharp image is formed 0.2m for an object at infinity. When the air between the glass pieces is replaced by water (mu=4/3), find the position of image.

Two thin similar convex glass are joined together front to front, with its rear portion silvered such that a sharp image is formed 0.2m for an object at infinity. When the air between the glass pieces is replaced by water (mu=4/3), find the position of image.

Two thin lenses of powers 2D and 3D are placed in contact. An object is placed at a distance of 30 cm from the combination The distance in cm of the image from the combination is

A convex lens focuses an object 40cm from it on a screen placed 10cm away from it. A glass plate ( mu=1.5 ) and of thickness 3cm is inserted between the lens and the screen. Where should the object be placed so that its image is again focused on the screen ?

A thin converging lens of focal length f= 25 cm forms the image of an object on a screen placed at a distance of 75 cm from the lens. The screen is moved closer to the lens by a distance of 25 cm. The distance through which the object has to be shifted, so that its image on the screen in sharp again is

A thin converging lens of focal length f = 25 cm forms the image of an object on a screen placed at a distance of 75 cm from the lens. Now the screen in moved closer to the lens by a distance of 25 cm. The distance through which the object has to be shifted so that its image on the screen is sharp again is