0
Why is a convex lens of small focal length preferred for a magnifying glass?
Wiki User
∙ 9y ago
Simply put, convex lenses make things look bigger. That is obviously beneficial in a magnifying glass. Focal length indicates the distance from the lens that something should be to be in the best focus (or not inverted). Therefore, a small focal length is best for magnifying glasses which are typically used to look at things that are very close to you.
Keely Brakus
Add your answer:
Earn +20 pts
Why the study was under taken of focal length of a convex lens by graphical method?
to determine the focal length of a convex mirror.
Why convex lens of short focal length is preferred on magnifying glass?
The power of a lens is measured in dioptres which is the reciprocal of the focal length in metres. A 5-dioptre lens would allow you to see something at a distance of 20 cm, while a 20-dioptre lens would allow the object to be seen from 5 cm (2 inches) so it would be more effective as a magnifying glass. Your arms are short.
What is a positive lens the same as?
A positive lens is also called a magnifying lens. It has convex surfaces and it has a measureable focal length where it produces an inverted image of a distant object. The power in dioptres is the reciprocal of the focal length in metres.
Which lens has a greater power convex lens of focal length 10 cm or a convex lens of focal length 20cm?
Power is inversely related to the focal length. So convex lens of focal length 20 cm has less power compared to that having focal length 10 cm
If the primary mirror of a telescope have a focal length of 225 centimeters and the eyepiece has a focal length of 7.5 millimeters then what is the magnifying power of the telescope?
The magnifying power of a telescope is the focal length of the scope in millimeters, divided by the focal length of the eyepiece in millimeters. Focal length of scope: 225cm=2250mm Focal length of eyepiece: 7.5mm 2250/7.5= 300X
What is the focal length of the convex lens?
The distance from the centre of the lens to the focal point.
What happens to the focal length of convex lens when convex lens is cutted vertically along the optic center?
its focal lenght becomes 2f
Length of a lens is the distance from the center of the lens to its principal focus?
It is called the focal length. It is equal to 1/2 times r, and is positive on concave mirrors and negative on convex mirrors.
Why a small focal length convex lens is used in simple microscope?
because manifying power has inerse relation with that of focal length
The relation between focal length and radius of curvature of spherical mirror is?
The focal length of a convex mirror is half of its radius of curvature.
What happens to focal length when convex lens is cut horizontally?
no change
What is the power of a convex lens with 10cm focal length?
1.0 diopters
