An object is placed in front of a thin convex lens of focal length 30 cm and a plane mirror is placed 15 cm behind the lens. If the final image of the object coincides with the object, the distance of the object from the lens is :

Question

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Answer 1

For autocallination by system, light should fall normally on plane mirror, since mirror is perpendicular to the principal axis. Hence the object must lie on secondary focus of the lens. From the Ray diagram $u = 30 c m$

Answer 2

For autocallination by system, light should fall normally on plane mirror, since mirror is perpendicular to the principal axis. Hence the object must lie on secondary focus of the lens. From the Ray diagram

u = 30 c m

An object is placed in front of a thin convex lens of focal length 30 cm and a plane mirror is placed 15 cm behind the lens. If the final image of the object coincides with the object, the distance of the object from the lens is :

60 cm

30 cm

15 cm

25 cm

For autocallination by system, light should fall normally on plane mirror, since mirror is perpendicular to the principal axis. Hence the object must lie on secondary focus of the lens. From the Ray diagram $u = 30 c m$

A biconvex lens of focal length 15 cm is in front of a plane mirror. The distance between the lens and the mirror is 10 cm. A small object is kept at a distance of 30 cm from the lens. The final image is

A convex lens of focal length f produce virtual image n times the size of the object then the distance of object from the lens is

Behind a thin converging lens having both the surfaces of the same radius $1 c m$ , a plane mirror has been placed. The image of an object at a distance of $40 c m$ from the lens is formed at the same position. What is the refractive index of the lens?

A convex lens, of focal length $30 c m$ , a concave lens of focal length $120 c m$ , and a plane mirror are arranged as shown. For an object kept at a distance of $60 c m$ from the convex lens, the final image, formed by the combination, is a real image, at a distance of :

A biconvex lens of focal length 15 cm is in front of a plane mirror. The distance between the lens and the mirror is 10 cm. A small object is kept at a distance of 30 cm from the lens. The final image is :

Revise with Concepts

Combination of Lenses in Contact

Problems on Lenses

An object is placed in front of a thin convex lens of focal length 30 cm and a plane mirror is placed 15 cm behind the lens. If the final image of the object coincides with the object, the distance of the object from the lens is :

60 cm

30 cm

15 cm

25 cm

For autocallination by system, light should fall normally on plane mirror, since mirror is perpendicular to the principal axis. Hence the object must lie on secondary focus of the lens. From the Ray diagram u=30cm

A biconvex lens of focal length 15 cm is in front of a plane mirror. The distance between the lens and the mirror is 10 cm. A small object is kept at a distance of 30 cm from the lens. The final image is

A convex lens of focal length f produce virtual image n times the size of the object then the distance of object from the lens is

Behind a thin converging lens having both the surfaces of the same radius 1 cm, a plane mirror has been placed. The image of an object at a distance of 40 cm from the lens is formed at the same position. What is the refractive index of the lens?

A convex lens, of focal length 30cm, a concave lens of focal length 120cm, and a plane mirror are arranged as shown. For an object kept at a distance of 60cm from the convex lens, the final image, formed by the combination, is a real image, at a distance of :

A biconvex lens of focal length 15 cm is in front of a plane mirror. The distance between the lens and the mirror is 10 cm. A small object is kept at a distance of 30 cm from the lens. The final image is :

Revise with Concepts

Combination of Lenses in Contact

Problems on Lenses

For autocallination by system, light should fall normally on plane mirror, since mirror is perpendicular to the principal axis. Hence the object must lie on secondary focus of the lens. From the Ray diagram $u = 30 c m$

Behind a thin converging lens having both the surfaces of the same radius $1 c m$ , a plane mirror has been placed. The image of an object at a distance of $40 c m$ from the lens is formed at the same position. What is the refractive index of the lens?

A convex lens, of focal length $30 c m$ , a concave lens of focal length $120 c m$ , and a plane mirror are arranged as shown. For an object kept at a distance of $60 c m$ from the convex lens, the final image, formed by the combination, is a real image, at a distance of :