Home
Class 12
PHYSICS
A man cannot see clearly the objects bey...

A man cannot see clearly the objects beyond a distance of 20 cm from his eyes. To see distant objects clearly he must use which kind of lenses and of what focal length

A

100 cm, convex

B

100 cm concave

C

20 cm convex

D

20 cm concave

Text Solution

Verified by Experts

The correct Answer is:
D
`1/F=1/v-1/u,u=oo,v=-20cm`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • RAY OPTICS AND OPTICAL INSTRAUMENTS

    NARAYNA|Exercise EXERCISE-2 (H.W)(OPTICAL INSTRUMENTS ( MICROSCOPES ))|5 Videos

  • RAY OPTICS AND OPTICAL INSTRAUMENTS

    NARAYNA|Exercise EXERCISE-2 (H.W)(OPTICAL INSTRUMENTS ( TELESCOPES ))|5 Videos

  • RAY OPTICS AND OPTICAL INSTRAUMENTS

    NARAYNA|Exercise EXERCISE-2 (H.W)(DISPERSION BY A PRISM)|4 Videos

  • NUCLEI

    NARAYNA|Exercise ASSERTION & REASON|5 Videos

  • SEMI CONDUCTOR DEVICES

    NARAYNA|Exercise Level-II (H.W)|36 Videos

Similar Questions

Explore conceptually related problems

We cannot clearly see an object kept at a distance less than 25 cm from the eye.

We cannot clearly see an object kept at a distance less than 25 cm from the eye.

Knowledge Check

  • A person cannot see beyond a distance of 50 cm.The power of corrective lens required to see distant object is

    A
    −1.5 D
    B
    −1.0D
    C
    −3 D
    D
    −2.0 D

  • A man can see the objects upto a distance of one metre from his eyes. For correcting his eye sight so that he can see an object at infinity, he requires a lens whose power is

    A
    `+ 0.5 D`
    B
    `+1.0 D`
    C
    `+ 2.0 D`
    D
    `-1.0 D`

    • Similar Questions

    Explore conceptually related problems

    We cannot clearly see an object kept at a distance less than 25 cm from the eye. Give reason

    How are we able to see nearby and also the distant objects clearly?

    How are we able to see nearby and also the distant objects clearly?

    Anil’s uncle cannot see nearby objects clearly, but he can see distant objects clearly. What is the eye defect he is suffering from ?

    Anil’s uncle cannot see nearby objects clearly, but he can see distant objects clearly. How is it corrected ?

    If a person can sees clearly at a distance of 100 cm, then find the power of leris used to see object at 40 cm.

    Home
    Profile