Home
Class 14
PHYSICS
Two similar thin equi-convex lenses, of ...

Two similar thin equi-convex lenses, of focal f each, are kept coaxially in contact with each other such that the focal length of the combination is `F_(1)`, When the space between the two lens is filled with glycerin (which has the same refractive index `(mu=1.5)` as that of glass) then the equivlent focal length is `F_(2)`, The ratio `F_(1): F_(2)` will be

A

`1 : 2`

B

`2 : 3`

C

`3 : 4`

D

`2 : 1`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Similar Questions

Explore conceptually related problems

Two thin converging lenses of focal length 15 cm and 30 cm are held in contact with each other. The focal length of the combination is

Two convex lenses of focal lengths 25 cm and 15 cm are placed in contact with each other. Find the focal length of combination.

Two convex lenses with power 2 dioptre are kept in contact with each other. The focal length of the combined lens system is

If two convex lenses of focal lengths 10 cm and 5 cm are kept in contact with each other , what is their combined focal length ?

A concave lens of focal length 12 cm and a convex lens of focal length 20 cm are kept in contact with each other . Find the focal length of the combination .

Two thin lenses of power + 3 D and - 1 D are held in contact with each other. Focal length of the combination is :

A convex lens of focal length f_(1) is kept in contact with a concave lens of focal length f_(2) . Find the focal length of the combination.