Download OPTICAL BENCH SET using METER STICK

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OPTICAL BENCH SET using METER STICK
N133-1404
Object Marker
Object Screen
Lens Support
Screen Support
Meter Stick Support (Pair)
The Optical Bench Set provides all component parts necessary for the construction of
a simple optical bench using a meter stick. This economical apparatus can be used in
a Physics or Physical Science classroom to investigate image formation and focal
lengths of lenses. The product requires a meter stick and a light source for operation.
Part can be purchased separately.
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THEORY
The distance from an object to the lens p and the distance from the lens to the image q are related by the formula:
In the formula, f is the focal length of the lens. the lateral magnification, defined as the ratio of the size of the image I to
the size of the object O, is equal to the ratio of q to p:
When a real image is formed by a single lens, it is inverted; this is represented by the minus sign in the equation.
EXPERIMENTS
Set up the optical bench with a light source, object marker, a lens of 15 cm focal length, and screen as shown in photo.
Place the object maker on the meter stick using the required distance. Place the light source at the end of the bench, the
object marker about 10 cm from the light source, and the lens exactly 50 cm from the object marker (p). Move the screen
on the bench until a sharp image is formed on the screen. Record the distance between the lens and the screen as (q).
Measure and record the size of the image (I).
Once the initial measurement is complete, vary the distance between the object marker and the lens and repeat the
above experiment. Record each object-lens distance (p), the corresponding image-lens distance (q) and the size of the
image (I). Verify the thin lens formula and the magnification formula with the data.
Once the thin lens formula has been verified, the focal length of an unknown covex lens can be determined.
DATA SHEET
Verify the thin lens formula, f = 15 cm
Determine the focal length of an unknown convex lens
Focal Length: ________________________________ cm
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