A real image of an object is formed at a distance of `20 cm` from a lens. On putting another lens in contact with it, the image is shifted `10 cm` towards the combination, Determine the power of the second lens.

A convex lens forms an image of a distant obj ect at distance of 20 cm from it. On keeping another lens in contact with the first, if the 40 image is formed at a distance of 40/3 cm from the combination, then the focal length of the second lens is

A lens forms real image of an object 20 cm away from lens. A second lens is kept in contact with this lens, then image shifts 10 cm towards the lens combination. Find the power of another lens.

Ray coming from an object situated at infinity, fall on a convex lens and an image is formed at a distance of 16 cm from the lens. When a concave lens is kept in contact with the convex lens, the image is formed at a distance of 20 cm from the lens combination. Calculate the focal length of the concave lens.

A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is equal to size of the object ? Also, find the power of the lens.

A convex lens forms a real and inverted image of a needle at a distance of 50 cm. from it . Where is the niddle placed in front of convex lens if the image is equal to the size of the object? Also , find the power of the lens.

A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is equal to size of the object ? Also, find the power of the lens.

A point object is placed at a distance of 15 cm from a convex lens. The image is formed on the other side of lens at a distance 30 cm from lens. When a concave lens is placed in contact with convex lens, image is shifted away further by 30 cm. calculate the focal lengths of the two lenses.

A point object is placed at a distance of 15 cm from a convex lens. The image is formed on the other side at a distance of 30 cm from the lens. When a concave lens is placed in contact with the convex lens, the image shifts away further by 30 cm. Calculate the focal lengths of the two lenses.