Advertisements
Advertisements
Question
Name the physical quantity whose unit is dioptre.
Solution
The power of a lens is a physical quantity with dioptre as it's unit.
APPEARS IN
RELATED QUESTIONS
Define 1 dioptre of power of a lens.
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:
Which one of the following materials cannot be used to make a lens?
The power of a lens is + 0.2 D. Calculate its focal length.
A convex lens of power 5 D and a concave lens of power 7.5 D are placed in contact with each other. What is the :
(a) power of this combination of lenses?
(b) focal length of this combination of lenses?
How is the power of a lens related to its focal length?
Define power of a lens. Write its units. Deduce the relation `1/f =1/f_1 +1/f_2`for two thin lenses kept in contact coaxially.
A normal eye is not able to see objects closer than 25 cm because
A 5.0 diopter lens forms a virtual image which is 4 times the object placed perpendicularly on the principal axis of the lens. Find the distance of the object from the lens.
The lens of power + 1·0 D is ______.
