Home
Class 10
PHYSICS
The focal length of a convex lens is 20 ...

The focal length of a convex lens is 20 cm. What is the power?

Text Solution

Verified by Experts

The correct Answer is:
Given: Focal length (f)=20 cm `= 20/100 m`
= 0.2 m
To find: Power of lens (P)= ?
Formula; `P= 1/(f(m))`
`P=1/(f(m))`
`therefore P= 1/(0.2)=10/2`
`therefore P=5 D`
Power fo lens is 5 dioptre.
Promotional Banner

Topper's Solved these Questions

  • LENSES

    CHETAN PUBLICATION|Exercise Define the following|19 Videos

  • LENSES

    CHETAN PUBLICATION|Exercise Distinguish between:|3 Videos

  • LENSES

    CHETAN PUBLICATION|Exercise Choose and write the correct option:|18 Videos

  • HEAT

    CHETAN PUBLICATION|Exercise ASSIGNMENT - 5 (Answer the following: (Any 1))|3 Videos

  • MODEL ACTIVITY SHEET

    CHETAN PUBLICATION|Exercise SOLVE THE FOLLOWING QUESTIONS : (ANY 1)|9 Videos

Similar Questions

Explore conceptually related problems

The focal length of the concave lens is 7 m. Calculate the power of lens.

The focal length of a convex lens is f. When it is divided in two parts by a plane parallel to the principal axis, focal length of each part will be _____

The focal length of a convex lens having a magnifying power of 12.5 X is ______

The focal length of a convex mirror is 20 cm, its radius of the curvature will be

Focal length of an equiconvex lens is 20 cm. If we cut it once perpendicular to principal axis in and then along principal axis. Then, focal length of each part will be:

An object is placed vertically at a distance of 20 cm from a convex lens. If the height of the object is 5 cm and the focal length of the lens is 10 cm, what will be the position, size and nature of the image? How much bigger will the image be as compared to the object?