Two convex lenses of focal length `20 cm` each are placed coaxially with a seoaration of `60 cm` between them. The image of the distant object formed by the combination is at _______cm from the frist lens.

Two convex lenses of focal length 20cm each are placed coaxially with a separation of 60cm between them. Find the image of a distant object formed by the combination by: a. Using thin lense formul separately for the two lenses, and b. Using the equivalent lens. Note that although the combination forms a real image of a distant object on the other side, it is equivalent to a diverging lens as far as the location of the final image is concerned.

Two convex lenses f focal length 20 cm each are placed coaxially with a separation of 60 cm between them. find the image of a distance object formed by the combination by a. using thin les formula separately for the two lenses and b. using the equivalent lens. Note that although the combination forms a real image of as distance object on the other side, it is equivalent to as diverging lens as far as the locatiion of the final image is concerned.

Two convex lenses of focal length 10 cm each are combined. What will be the focal length of the combined lens ?

Two plano-convex lenses of focal lengths 20cm and 30cm are placed together to form a double convex lens. The final focal length will be

A convex lens of focal length 15 cm is placed on a plane mirror. An object is placed 20 cm from the lens. The image is formed

A convex lens of focal length 15 cm is placed on a plane mirror. An object is placed at 30 cm from the lens. The image is

A convex lens of focal length 10 cm is placed in contact with a concave lens of focal length 20 cm. The focal length of this combination of lenses will be:

A convex lens of focal length 20 cm is placed co-axially with a convex mirrir of radius of curvature 20 cm . The two are kept 15 cm apart from eachother. A point object is placed 60 cm in front of the convex lens. Find the position of the image formed by the combination.

A point object is placed at a distance of 12 cm from a convex lens of focal length 10 cm. On the other side of the lens, a convex mirror is placed at a distance of 10 cm from the lens such that the image formed by the combination coincides with the object itself. The focal length of the convex mirror is

A diverging lens of focal length 12 cm and a converging mirror of focal length 10 cm are placed coaxially at a separation of 5 cm. Where should an object be placed so that a real image is formed at the object itself ?