Home
Class 11
PHYSICS
The far point of a myopic person is 150 ...

The far point of a myopic person is `150 cm` in front of the eye. Calculate the focal length and power of a lens required to enable him to see distant objects clearly.

Text Solution

Verified by Experts

The correct Answer is:
`-1.5 m, -0.67 D`
Here, `v = x = -150 cm, u = oo, f = ?`
from `(1)/(f)=(1)/(v)-(1)/(u)=(1)/(-150)-(1)/(oo)`
`f = -150 cm = -1.5 m`
`P = (1)/(f) = (1)/(-1.5) = -0.67 D`.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • RAY OPTICS

    PRADEEP|Exercise (Test Your Grip)Multiple Choice (b)|10 Videos

  • RAY OPTICS

    PRADEEP|Exercise (Test Your Grip)Multiple Choice (c)|10 Videos

  • RAY OPTICS

    PRADEEP|Exercise Problem For Practice(c)|27 Videos

  • PROPERTIES OF BULK MATTER

    PRADEEP|Exercise Multiple choice questions|7 Videos

  • SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

    PRADEEP|Exercise Assertion- Reason Type questions|20 Videos

Similar Questions

Explore conceptually related problems

The far point of a person having myopia is 200 cm in front of the eye. Find the focal length and power of lens required to enable him see the distant objects clearly.

The far point of a myopic person is 120 cm in front of the eye. Calculate the power of the lens required to enable the person see distant object clearly.

Knowledge Check

  • Far point of a person is 150 cm. Calculate the focal length and power of a lens required to make him see correctly :

    A
    50 cm, 2D
    B
    `-50cm, -2D`
    C
    100 cm, 1D
    D
    `-150 cm, -0.66D`

  • Question Stimulus :- The far point of a myopic person is 1.00 m in front of the eye. The focal length of the lens required to correct the problem is

    A
    1.25  m
    B
    ‐ 0.80 m
    C
    ‐ 1.00 m
    D
    +1.00 m

    • Similar Questions

    Explore conceptually related problems

    The near point of a person having hypermetropia is 60 cm in front of the eye. Find the focal length and power of lens required to enable him to see the objects clearly placed at 25 cm from the eye.

    The for point of a myopic person is 80 cm in front of the eye. What is the power of the lens required to enable him to see very distant objects clearly? In what way does the corrective lens help the above person? Does the lens magnify very distant object? Explain.

    (a) The far point of a myopic person is 80 cm . In front of the eye. What is the power of the lens required to enable him to see very distant objects clearly ? (b) In what way does the corrective lens help the person above ? Does the lens magnify very distant objects ? Explain carefully. ( c) The person above prefers to remove his spectacles while reading a book. Explain why ?

    The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?

    The far point of a myopic person is 80 cm in front of the eye. What is the nataure and power of the lens required to correct the problem ?

    The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?

    Home
    Profile