A convex lens of focal length 40cm is held at a distance 12cm coaxially above a concave mirror of focale length 18cm.

Q. A luminous point object placed d cm above the lens on its axis gives rise to an imag coincident iwth itself, then the value of d is equal to

A convex lens of focal length 40cm is held at a distance 12cm coaxially above a concave mirror of focale length 18cm. Q. If the convex lens is replaced by a concave lens of focal llength 60cm, it gives rise to an image coincident with itself. then the value of d is

A convex lens of focal length 40cm is held at a distance 12cm coaxially above a concave mirror of focale length 18cm. Q. If the convex lens is replaced by a glass plate of thickness 6cm, refractive index mu=(3)/(2) and gives rise to an image coincident with itself, then the value of d is equal to

A convex lens of focal length 40cm is held at a distance 12cm coaxially above a concave mirror of focale length 18cm. Q. If the convex lens is replaced by a glass plate of thickness 6cm, refractive index mu=(3)/(2) and gives rise to an image coincident with itself, then the value of d is equal to

A convex lens of focal length 40cm is in contact with a concave lens of focal length 25cm. The power of the combination is

A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm. The power of the combination is

A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm. The power of the combination is

A convex lens of Focal length of 40cm is in contact with a concave lens of focal length 25cm. The power of the combination is.

a concave lens of focal length 20cm is placed in contact with a convex lens of focal length 40cm. Find the power of the combination.

A convex lens of focal length 20cm is placed 10cm in front of a convex mirror or radius of curvature 15cm. Where should a point object be placed in front of the lens so that it images on to itself?

A convex lens of focal length 20cm is placed 10cm in front of a convex mirror or radius of curvature 15cm. Where should a point object be placed in front of the lens so that it images on to itself?