Two thin lenses have a combined power of +9D.When they are separated by a distance of 20 cm, then their equivalent power becomes `+27/5` D. Their individual powers (in dioptre) are

Two thin lenses have a combined power of +9 D . When they are separated by a distance of 20 cm, their equivalent power becomes 27/5 D . Their individual powers (in diopters) are..............

Two thin lenses have a combined power of +9 D.When they are sparated by a distance of 20 cm. Their equivalent power becomes +(27)/(5)D .Their individual powers (in diopters)are

Two thin lens have a combined power of 10D in contact. When separated by 20 cm their equivalent power is 6.25D . Find teir in dividual powers in dioptres-

Two lenses having focal lengths +0.20 m and -0.30 m are separated by a distance of 0.15 m. Find the resultant power of the combination.

Two convex lenses of power 2 D and 3 D are separated by a distance 1/3m . The power of the optical system formed is

Two convex lenses of powers 4D and 6D are separated by a distance of (1)/(6)m . The power of the optical system so formed is

Two thin lenses having optical powers of -10 D and + 6 D are placed in contact with each other. The focal length of the combination is :

When two lenses are kept touching each other, the power of the combined lens is equal to the sum of their individual powers.

When two lenses are kept touching each other, the power of the combined lens is equal to the sum of their individual powers.