The teacher selects the Light tab on the web page, and chooses Concave and Convex mirrors option.
The teacher should make the students draw the ray diagrams for the standard object positions followed by observation on this simulation.(at infinity, beyond C, at C, between C and F, at F, between F and the pole of the mirror P) on paper using the standard rays.( Table 2 textbook pg no. 6)
During the Activity:
When the object is at the far left-side of the grid, the class can observe the inverted diminished image formed at the point where the 3 standard reflected rays meet. The teacher points out the symbols used in the simulation (do = object distance, di = image distance, ho = object height etc)
As the object is pulled closer to the mirror, students observe the behaviour of the image. Ask them these questions: Does it move away, does it grow larger. When is the image the same size and distance as the object? Is it inverted still?
Students observe the behaviour of the image as the object is pulled even closer, from C to F. As the image moves farther and farther away, it can no longer be shown within the grid of the simulation. Ask students: So, we can still conclude that the image is formed at some great distance. How?
When the object is at the focal point, ask students to observe and respond: What happens to the reflected rays? Are they parallel? Can an image form?
What happens as the object moves slightly closer than focus (to the right of focus)? Is the image real? inverted? magnified? (since the image forms beyond the grid, and is not shown by the simulator, students have to make inferences that the image forms at a large distance, and is erect and virtual.
In the last case, the standard ray passing through the centre of curvature may not fall on the mirror. It misses the mirror. But we only need any 2 standard rays to locate the image.
[Contributed by raju.sambari@tiss.edu on 31. Juli 2023 17:49:32]
Activity:
Prior starting the activity:
The teacher selects the Light tab on the web page, and chooses Concave and Convex mirrors option.
The teacher should make the students draw the ray diagrams for the standard object positions followed by observation on this simulation.(at infinity, beyond C, at C, between C and F, at F, between F and the pole of the mirror P) on paper using the standard rays. ( Table 2 textbook pg no. 6)
During the Activity:
When the object is at the far left-side of the grid, the class can observe the inverted diminished image formed at the point where the 3 standard reflected rays meet. The teacher points out the symbols used in the simulation (do = object distance, di = image distance, ho = object height etc)
As the object is pulled closer to the mirror, students observe the behaviour of the image. Ask them these questions: Does it move away, does it grow larger. When is the image the same size and distance as the object? Is it inverted still?
Students observe the behaviour of the image as the object is pulled even closer, from C to F. As the image moves farther and farther away, it can no longer be shown within the grid of the simulation. Ask students: So, we can still conclude that the image is formed at some great distance. How?
When the object is at the focal point, ask students to observe and respond: What happens to the reflected rays? Are they parallel? Can an image form?
What happens as the object moves slightly closer than focus (to the right of focus)? Is the image real? inverted? magnified? (since the image forms beyond the grid, and is not shown by the simulator, students have to make inferences that the image forms at a large distance, and is erect and virtual.
In the last case, the standard ray passing through the centre of curvature may not fall on the mirror. It misses the mirror. But we only need any 2 standard rays to locate the image.