Ray diagrams Flashcards
(20 cards)
What is the aim of the Ray Diagrams lesson?
To show how to image extended objects, the importance of the first and second focal lengths, and how to use the nodal ray of an optical system.
What are the learning outcomes for students in this lesson?
Students will be able to show the image formation of an extended object and calculate the magnification produced by an optical system.
What does magnification (M) represent?
Magnification is a measure of the image in terms of the object, calculated as M = h’/h.
If the object is 10mm high and the image is 40mm high, what is the magnification?
X4
What is minification in terms of magnification?
Minification occurs when the image height is less than the object height, for example, 10/40 = X0.25.
What is the magnification when the image height equals the object height?
X1
How is magnification calculated using similar triangles?
Magnification can be calculated using the formula h’/h = (ℓ’ - r)/(ℓ - r).
What is the radius of curvature for a convex curved surface if the radius given is 5cm?
5cm
What is the refractive index of glass in the examples provided?
1.6 and 1.8 for different examples.
What is the formula for calculating the power of a surface?
Power = 1/f, where f is the focal length.
What happens to the image when the object is placed 20cm from a convex curved surface?
The image distance, image size, and nature of the image need to be calculated.
How do you determine the image size using the triangle method?
By using the relationship h’ = h(ℓ’ - r)/(ℓ - r).
Fill in the blank: The first focal length of a refracting surface is _____ cm.
-12.5
True or False: The nature of the image can be described as real or virtual.
True
What must be drawn to represent the optical system in the examples provided?
A diagram to represent the optical system.
What is the height of the object in Question 1?
8mm
What is the radius of curvature of the surface in Question 2?
10cm
What is the height of the object in Question 3?
12mm
What is the refractive index of the glass in Question 3?
1.7
What needs to be calculated for a real object in air placed 16.7cm from a curved refracting surface?
The power of the surface, radius of curvature, image distance, second focal length, magnification, and nature of the image.
