A convex lens of focal length A and a co...

A convex lens of focal length A and a concave lens of focal length B are placed in contact. The focal length of the combination is

`(A+B)`

`(A-B)`

`(AB)/((A+B))`

`(AB)/((B-A))`

Text Solution

Verified by Experts

The correct Answer is:

Topper's Solved these Questions

RAY OPTICS
MOTION|Exercise Exercise-2|39 Videos
RAY OPTICS
MOTION|Exercise Exercise-3|65 Videos
RAY OPTICS
MOTION|Exercise Questions For Practice|29 Videos
RADIOACTIVITY & NUCLEAR PHYSICS
MOTION|Exercise Exercise-3|81 Videos
ROTATIONAL MOTION
MOTION|Exercise Exercise - 3 ( Section-B )|24 Videos

Similar Questions

Explore conceptually related problems

A convex lens of focal length x and a concave lens of focal length y are placed in contact. The focal length of the combination is

A convex lens of focal length 40 cm a concave lens of focal length 40 and a concave lens of focal length 15 cm are placed in contact. The power of this combination of are placed in contact. The power of this combination in diopters is

A convex lens of focal length 30 cm and a concave lens of focal length 0.6m are placed in contact. Find the power of the combination.

A convex lens of focal length 50 cm, a concave lens of focal length 50 cm and a concave lens focal lens 20 cm are placed in contact. The power of this combination in diopters will be

A convex lens of focal length 25 cm and a concave lens of focal length 10 cm are joined together. The power of the combination will be

A convex lens of focal length 10cm and concave lens of focal length 20 cm are kept 5 cm apart. The focal length of the equivalent lens is

We combined a convex lens of focal length f_(1) and concave lens of focal lengths f_(2) and their combined focal length was F . The combination of these lenses will behave like a concave lens, if

A convex lens of focal length 25 cm and a concave lens of focal length 10 cm are placed in close contact with one another. a) What is the power of this combination? b) What is the focal length of this combination? c) Is the combinatioin converging or diverging?

MOTION-RAY OPTICS-Exercise-1

When two thin lenses are kept in contanct, the focal length of the com...
Text Solution
|
A thin convex lens of focal length 10 cm and a thin concave lens of f...
Text Solution
|
A convex lens of focal length A and a concave lens of focal length B a...
Text Solution
|
When a thin convex lens is put in contact with a thin concave lens of ...
Text Solution
|
If I(1) and I(2) be the size of the images respectively for the two po...
Text Solution
|
A convex lens forms a real image on a screen placed at a distance 60 c...
Text Solution
|
A plano-convex lens when silvered on the plane side behaves like a con...
Text Solution
|
The plane surface of a plano-convex lens of focal length f is silvered...
Text Solution
|
A concave lens of focal length 25 cm and a convex lens of focal length...
Text Solution
|
Two lenses of power +2.50D and -3.75D are combined to form a compound ...
Text Solution
|
Lenses of powers 3D and -5D are combined to from a compound lens. An o...
Text Solution
|
An object placed at a distance of a 9cm from the first principal focus...
Text Solution
|
A convex lens of Focal length of 40cm is in contact with a concave len...
Text Solution
|
An object is put at a distance of 5cm from the first focus of a convex...
Text Solution
|
Focal length of convex lens is f. If this lens is cut along parallel t...
Text Solution
|
In the figure shown, there are two convex lenses L(1) and L(2) having ...
Text Solution
|
What should be the value of distance d so that final image is formed o...
Text Solution
|
If the central portion of a convex lens is wrapped in black paper as s...
Text Solution
|
Focal length of a convex lens will be maximum for
Text Solution
|
A convex lens form a real image of a point object placed on its princi...
Text Solution
|