A convex lens is put 10 cm from a light source and it makes a sharp image on a screen, kept 10 cm from the lens. Now a glass block (refractive index 1.5) of 1.5 cm thickness id placed in contact with the light source. To get the sharp image again, the screen is shifted by a distance d. Then d is :

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

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

An object 240 cm in front of a lens forms a sharp image on a screen 12 cm behind the lens. A glass slab 1 cm thick, having refractive index 1.50 is placed between the lens and the screen with its refracting faces perpendicular to the principal axis of the lens. (a) By how much distance the object must be moved so as to again cast a sharp image on the screen? (b) Another identical glass slab is interposed between the object and the lens. How much further the object shall be moved so as to form a sharp image on the screen.

A screen is placed at a distance of 5 cm from a point source. A 5 mm thick piece of glass of refractive index 1.5 is placed between them. What is the length of optical path between the source and the screen ?

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 parallel beam of light is incident on a lens of focal length 10 cm. A parallel slab of refractive index 1.5 and thickness 3 cm is placed on the other side of the lens. Find the distance of the final image from the lens. .

A parallel beam of light is incident on a lens of focal length 10 cm. A parallel slab of refractive index 1.5 and thickness 3 cm is placed on the other side of the lens. Find the distance of the final image from the lens. .

A convex lens focusses ab object 10 cm from it on a screen paced 10 cm away from it. A goes plate (mu=1.5) of thickenss 1.5 cm is inserted between tehlens and the screen. Where should the object be placed so that its image is again focussed on the screen?