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An object O is placed in front of a conv...

An object O is placed in front of a convex lens such that the lens forms a sharp image on the screen. The distance between the object and screen is 10 cm. The lens is made of glass at refractive index `mu_(g) = (3)/(2)`. The surrounding medium is air with refractive index 1.

The focal length of the lens, used in the above experiment, satisfies the condition given by

A

`f gt 5 cm`

B

`5 cm lt f lt 10 cm`

C

`0 lt f le 2.5 cm`

D

`2.5 le f le 5 cm`

Text Solution

Verified by Experts

The correct Answer is:
C
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Knowledge Check

  • A lens is made of flint glass (refractive index =1.5 ). When the lens is immersed in a liquid of refractive index 1.25 , the focal length:

    A
    increases by a factor of `1.25`
    B
    increases by a factor of `2.5`
    C
    increase by a factor of `1.2`
    D
    decrease by a factor of `1.2`

  • A lens is made of flint glass (refractive index = 1.5). When the lens is immersed in a liquid of refractive index 1.25, the focal length

    A
    Increases by a factor of 1.25
    B
    Increases by a factor of 2.5
    C
    Increases by a f actor of 1.2
    D
    Decreases by a factor of 1.2

  • A lens is made of flint glass (refractive index = 1.5) when the lens is immersed in a liquid of refractive index 1.25, the focal length :

    A
    Increases by a factor of 1.25
    B
    Increases by a factor of 2.5
    C
    Increases by a factor of 1.2
    D
    Decreases by a factor of 1.2