0
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 else can I help you with?
Why is convex lens of small focal-length preferred for magnifying glass?
A convex lens with a small focal length has a greater magnifying power, allowing it to produce a larger and clearer image when used as a magnifying glass. This is because the shorter focal length allows the lens to bend light rays more sharply, resulting in a more pronounced magnification effect.
How are images produced by the convex lens of a magnifying glass are affected by focal length?
The focal length of a convex lens determines the magnification of the image produced by the magnifying glass. A shorter focal length will result in a larger magnification, making the image appear bigger. Conversely, a longer focal length will result in a smaller magnification, making the image appear smaller.
What are the properties of a convex lens?
A convex lens is thicker at the center than at the edges and converges light rays to a focal point. It forms real or virtual images depending on the object distance and focal length. Convex lenses are used in magnifying glasses, cameras, and telescopes.
Is a convex lens used as magnifying glass?
Yes, a convex lens can be used as a magnifying glass as it converges light rays to form an enlarged and upright image of an object placed closer to the lens. The magnification produced by a convex lens depends on its focal length and the distance between the lens and the object.
Do convex lenses have negative focal length?
No, convex lenses have positive focal lengths. The focal length is the distance from the lens to its focal point where light rays converge. In convex lenses, parallel light rays are focused to a point on the opposite side of the lens, resulting in a positive focal length.
Why is convex lens of small focal-length preferred for magnifying glass?
A convex lens with a small focal length has a greater magnifying power, allowing it to produce a larger and clearer image when used as a magnifying glass. This is because the shorter focal length allows the lens to bend light rays more sharply, resulting in a more pronounced magnification effect.
Why is a convex lens of small focal length preferred for a magnifying glass?
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.
How are images produced by the convex lens of a magnifying glass are affected by focal length?
The focal length of a convex lens determines the magnification of the image produced by the magnifying glass. A shorter focal length will result in a larger magnification, making the image appear bigger. Conversely, a longer focal length will result in a smaller magnification, making the image appear smaller.
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.
What are the properties of a convex lens?
A convex lens is thicker at the center than at the edges and converges light rays to a focal point. It forms real or virtual images depending on the object distance and focal length. Convex lenses are used in magnifying glasses, cameras, and telescopes.
Is a convex lens used as magnifying glass?
Yes, a convex lens can be used as a magnifying glass as it converges light rays to form an enlarged and upright image of an object placed closer to the lens. The magnification produced by a convex lens depends on its focal length and the distance between the lens and the object.
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.
Do convex lenses have negative focal length?
No, convex lenses have positive focal lengths. The focal length is the distance from the lens to its focal point where light rays converge. In convex lenses, parallel light rays are focused to a point on the opposite side of the lens, resulting in a positive focal length.
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.
Why focal length of convex lens is easier to find than a concave lense?
The focal length of a convex lens is easier to find than a concave lens because for a convex lens, the focal length is positive and is measured from the lens to the focal point. In contrast, for a concave lens, the focal length is negative and the rays of light are diverged. This makes it more challenging to find the focal point accurately.
What is the power of a convex lens with 10cm focal length?
The power of a lens is calculated as the reciprocal of its focal length in meters. Therefore, a convex lens with a 10 cm focal length has a power of +10 diopters.
