Class 10 Exam > Class 10 Videos > To determine the focal length of a convex lens by focusing a distant object - Lab Exp.
To determine the focal length of a convex lens by focusing a distant object - Lab Exp. Video Lecture - Class 10
FAQs on To determine the focal length of a convex lens by focusing a distant object - Lab Exp. Video Lecture - Class 10
| 1. What is the purpose of determining the focal length of a convex lens? |  |
Ans. Determining the focal length of a convex lens helps in understanding its optical properties and its ability to converge or diverge light rays. This information is crucial in various applications such as designing optical instruments, cameras, and telescopes.
| 2. How can we determine the focal length of a convex lens by focusing a distant object? | |
Ans. To determine the focal length of a convex lens, we can focus a distant object on a screen placed behind the lens. By adjusting the position of the screen, we can obtain a sharp and focused image of the distant object. The distance between the lens and the screen is equal to the focal length of the lens.
| 3. What is a convex lens? | |
Ans. A convex lens is a transparent optical device with at least one curved surface that bulges outward. It is thicker at the center and thinner at the edges. Convex lenses are capable of converging light rays, bringing them to a focus, and are commonly used in various optical systems.
| 4. What are the factors that affect the focal length of a convex lens? | |
Ans. The focal length of a convex lens is primarily determined by its curvature and refractive index. A lens with a shorter radius of curvature or a higher refractive index will have a shorter focal length. The thickness of the lens and the medium surrounding it also affect its focal length.
| 5. Can the focal length of a convex lens be negative? | |
Ans. Yes, the focal length of a convex lens can be negative. A negative focal length indicates that the lens is a diverging lens, incapable of converging light rays. This occurs when the lens is extremely thin or has a lower refractive index compared to the surrounding medium. Negative focal length lenses are commonly used in correcting vision defects such as myopia (nearsightedness).
Text Transcript from Video
to determine the focal length of a
convex lenss by focusing a distant
object
a pirate is required double convex lenss
convex lenss stand the screen fitted
with stiff white cardboard metre scale
procedure locate some distant building
or a tree from the window of your
laboratory
place the meter scale in the direction
of the object place a convex lenss
duly mounted on the lens stand
vertically along the meter scale such
that the midpoint of its base is at five
centimeter mark place the white screen
behind the lens such that the base of
lens stand and screen remain in line
with scale move the screen backward or
forward till a sharp inverted and
diminished image of the distant object
is formed on it read and records the
position of the lens and the screen by
looking vertically down at the midpoint
of the basis when a well-defined sharp
image is formed on the screen the
distance between the position of the
lens and screen is equal to the focal
length of convex lens recall it to the
focal length of lens
repeat the experiment by placing convex
lenss at 10 centimeter 15 centimeter and
20 centimeter marks and in each case
record the focal length
you
calculate the mean or average focal
length from the data
you
convex lenss by focusing a distant
object
a pirate is required double convex lenss
convex lenss stand the screen fitted
with stiff white cardboard metre scale
procedure locate some distant building
or a tree from the window of your
laboratory
place the meter scale in the direction
of the object place a convex lenss
duly mounted on the lens stand
vertically along the meter scale such
that the midpoint of its base is at five
centimeter mark place the white screen
behind the lens such that the base of
lens stand and screen remain in line
with scale move the screen backward or
forward till a sharp inverted and
diminished image of the distant object
is formed on it read and records the
position of the lens and the screen by
looking vertically down at the midpoint
of the basis when a well-defined sharp
image is formed on the screen the
distance between the position of the
lens and screen is equal to the focal
length of convex lens recall it to the
focal length of lens
repeat the experiment by placing convex
lenss at 10 centimeter 15 centimeter and
20 centimeter marks and in each case
record the focal length
you
calculate the mean or average focal
length from the data
you
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