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Question
State power of a lens S.I. unit.
Solution
The S.I. unit of power is diopter (D).
RELATED QUESTIONS
Ranbir claims to have obtained an image twice the size of the object with a concave lens. Is he correct? Give a reason for your answer.
Consider two statements A and B given below:
A: real image is always inverted
B: virtual image is always erect
Out of these two statements:
The focal length of a convex lens is 25 cm. What is its power?
A convex lens of focal length 25 cm and a concave lens of focal length 10 cm are placed in close contact with one another.
(a) What is the power of this combination?
(b) What is the focal length of this combination?
(c) Is this combination converging or diverging?
How is the power of a lens related to its focal length?
The power of a lens is + 1.0 D is :
A diverging lens of focal length 20 cm and a converging lens of focal length 30 cm are placed 15 cm apart with their principal axes coinciding. Where should an object be placed on the principal axis so that its image is formed at infinity?
A convex lens is of focal length 20 cm. Find its power.
If focal length of a convex lens is 20 cm at what is the power of the lens?
An object is placed in front of a converging lens. Obtain the conditions under which the magnification produced by the lens is
- negative and
- positive.
