Two this lenses, when in contact, produce a combination of power `+10` diopters. When they are 0.25 m apart, the power reduces to `+6` diopters. The focal length of the lenses are…. `m` and …`m`.

Two thin lenses, when in contact, produce a combination of power +10 diopters. When they are 0.25m apart, the power reduces to +6 diopters. The focal lengths of the lenses are m and "________________" m

Two thin lenses, when in contact, produce a combination of power +10 diopters. When they are 0.25m apart, the power reduces to +6 diopters. The focal lengths of the lenses are m and "________________" m

Two thin lenses, when in contact, produce a combination of power +10 dioptres. When they are 0.25m apart, the power is reduced to +6 dioptres. The power of the lenses in dioptres, are

Two thin lenses,when in contact,produce a combinatin of power+10 dioptres.When they are 0.25 m apart,the power reduces to +6 dipotres.Find the power of the two lenses.

Focal length of combination of two thin lenses is 1 m. Calculate the power of one lens if the focal length of other lens is 30 cm.

An astronomical telescope of magnifying power 10 consists of two thin lenses 55 cm apart. Calculate the focal length of the lenses.