Home
Class 12
PHYSICS
Two identical glass (mu(g)=3//2) equi- c...

Two identical glass `(mu_(g)=3//2)` equi- convex lenses of focal length f each are kept in contact. The space between the two lenses is also filled with water `(mu_(g)=4//3).` The focal length of the combination is

A

`4f//3`

B

`3f//4`

C

`f//3`

D

`f`

Text Solution

Verified by Experts

The correct Answer is:
B

`f_(1)=f_(3) =(R )/(2((3)/(2)-1)) =R=f` (given)
`f_(2)=(R )/(2((4)/(3)-1)) =(-3)/(2)R = -(3)/(2)f`
`(1)/(f_(eq)) =(1)/(f_(1)) +(1)/(f_(2)) +(1)/(f_(3)) =(1)/(f) +(-(2)/(3f)) +(1)/(f)`
`rArr (1)/(f_(eq)) =(4)/(3f) rArr f_(eq) =(3f)/(4)`
Promotional Banner

Topper's Solved these Questions

  • NTA TPC JEE MAIN TEST 55

    NTA MOCK TESTS|Exercise PHYSICS (SUBJECTIVE NUMERICAL)|10 Videos

  • NTA TPC JEE MAIN TEST 54

    NTA MOCK TESTS|Exercise PHYSICS|30 Videos

  • NTA TPC JEE MAIN TEST 56

    NTA MOCK TESTS|Exercise PHYSICS |30 Videos

Similar Questions

Explore conceptually related problems

Two identical glass (mu_(g)=3//2) equi- convex lenses of focal length f each are kept in contact. The space between the two lenses aiisolfilled with water (mu_(g)=4//3). The focal length of the combination is

Two identical glass (mu_(g)=3//2) equiconvex lenses of focal length f are kept ini contact. The space between the two lenses is filled with water (mu_(w)=4//3) . The focal length of the combination is

Two identical glass (mu_(g)=3//2) equiconvex lenses

Two identical glass (mu_(g)=3//2) equiconvex lenses of focal length f are kept in contact. The space between the two lenses is filled with water (mu_(w)=4//3) . The focal length of the combination is

Two identical equiconvex lenses of refractive index 3//2 and focal length 16 cm are kept in contact. The space between the lenses is filled with water of refractive index 4//3 . What is the focal length of the combination ?

Two concave lenses L_1 and L_2 are kept in contact with each other. If the space between the two lenses is filled with a material of smaller refractive index, the magnitude of the focal length of the combination

Two lenses of power 15D and -3D are placed in contact. The focal length of the combination is a

Two concave lenses each of focal length 30 cm are placed in contact. What is focal of the compound lens ?

Two equi convex lenses each of focal lengths 20 cm and refractive index 1.5 are placed in & contact and space between them is filled with water of refractive index 4/3 . The combination works as

Three lenses lenses of focal length 20 cm each are kept in contact with each other . Find the power of their combination.