Home
Class 10
PHYSICS
If there is an increase or decrease in t...

If there is an increase or decrease in the focal length of a lens, what will be the effect on the power of the lens ?

A

Both A and R are true, and R is the correct explanation of A

B

Both A and R are true, but R is not the correct explanation of A

C

A is true but R is false.

D

A is false but R is true.

Text Solution

Verified by Experts

The correct Answer is:
A
Explanation : Power P of lens is equal to reciprocal of the length f i.e. `P=1/(f("in metre"))`
Thus when focal lengt of lens increases, then its power decreases.
Promotional Banner

Similar Questions

Explore conceptually related problems

Define focal length of a lens and give its relation with power of the lens.

If the focal length of the biconvex lens is 25 cm, then the power of the lens will be

Power of a lens is + 3 D. What will be the focal length of the lens?

The focal length of a lens of power + 4D is :

If f is focal length of the lens, then the power of a lens is equal to

The focal length of the combination of two thin lenses in contact is 80 cm. If the focal length of one lens is -20 cm, what is the power of the other lens ?