Advertisements
Advertisements
Question
On reducing the focal length of a lens, its power ______.
Options
Decreases
Increases
Does not change
First increases then decreases.
Advertisements
Solution
On reducing the focal length of a lens, its power increases.
APPEARS IN
RELATED QUESTIONS
Define the power of a lens.
State power of a lens S.I. unit.
How unit of power related to focal length of a lens?
Give the usual name for the following:
A point inside a lens through which the light passes undeviated.
An object of height 4 cm is placed at a distance of 15 cm in front of a concave lens of power, −10 dioptres. Find the size of the image.
How does the power of a lens change if its focal length is doubled?
Name the type of lens whose power is positive.
The image of an object formed by a lens is real, inverted and of the same size as the object. If the image is at a distance of 40 cm from the lens, what is the nature and power of the lens ? Draw ray diagram to justify your answer.
How does focal length of a lens change when red light incident on it is replaced by violet light? Give reason for your answer.
How is accommodation produced?
When monochromatic red light is used instead of blue light in a convex lens, its focal length will ______.
