Two convex lens, of focal length 25 cm a...

Two convex lens, of focal length 25 cm and 20 cm respectively are put in contact to form a combination of lenses. The power of combination

A

`(1)/(9)` diopter

B

9 diopter

C

6 diopter

D

45 diopter

Text Solution

Verified by Experts

The correct Answer is:

B

Topper's Solved these Questions

FULL TEST 3
RESONANCE ENGLISH|Exercise Exercise|30 Videos
GRAVITATION
RESONANCE ENGLISH|Exercise Exercise|21 Videos

Similar Questions

Explore conceptually related problems

A convex lens and a concave lens, each having same focal length of 25 cm , are put in contact to form a combination of lenses. The power in diopters of the combination is

Two thin lenses of focal lengths 20 cm and -20 cm are placed in contact with other. The combination has a focal length equal to

Two thin lenses of focal lengths 20 cm and 25 cm are placed in a contact. The effective power of the combination is

Two convex lenses of focal length 10 cm and 20 cm respectively placed coaxially and are separated by some distance d. The whole system behaves like a concave lens. One of the possible value of d 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

An eye specialist prescribes spectacles having combination of convex lens of focal length 40cm in contact with a concave lens of focal length 25cm. The power of this lens combination in diopters is

Two lenses of focal lengths 20 cm and - 40 cm are held in contact. The image of an object at infinity will be formed by the combination at

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

RESONANCE ENGLISH-GEOMETRICAL OPTICS-Exercise

A light waves travels from glass to water. The refractive index for gl...
Text Solution
|
When a beam of light goes from denser medium (m(d)) to rarer medium (m...
Text Solution
|
The image for the converging beam after refraction through the curved ...
Text Solution
|
A thin linear object of size 1mm is kept along the principal axis of a...
Text Solution
|
A medium has nv = 1.56, nr=1.44. Then its dispersive power is:
Text Solution
|
A Galileo telescope has an objective of focal length 100cm and magnif...
Text Solution
|
A convex lens of focal length A and a concave lens of focal length B a...
Text Solution
|
Two convex lens, of focal length 25 cm and 20 cm respectively are put ...
Text Solution
|
When the distance between the object and the screen is more than 4 f....
Text Solution
|
A plano-convex lens is made of glass of refractive index 1.5. The radi...
Text Solution
|
An astronomical telescope has an angular magnification of magnitude 5 ...
Text Solution
|
In order to decrease the magnifying power of a telescope
Text Solution
|
An opera glass (Galilean telescope ) measures 9cm from the objective t...
Text Solution
|
The numerical value of the length of Galilean telescope for normal vis...
Text Solution
|
The magnifying power of compound microscope in terms of the magnificat...
Text Solution
|
In a simple microscope, if the final image is located at infinity then...
Text Solution
|
An achromatic combination of lenses is formed by joining
Text Solution
|
In a simple microscope, if the final image is located at 25 cm from th...
Text Solution
|
STATEMENT -1: There exists two angles of incidence for the same deviat...
Text Solution
|
STATEMENT-1: A lens has two principal focal lengths which may be diffe...
Text Solution
|