Science: Light

Light - Grade 7 - Youtube playlist for all these videos.

Fire using convex lens.

Reading glasses to ignite a fire.

Spoon to light a fire.

Myopia correction using concave lens.

Hypermetropia correction using convex lens.

concave/convex mirror online simulation

Concave lens simulation.

Convex lens simulation.

Convex lens converges and concave lens diverges:
https://www.youtube.com/shorts/FNqGJPVLkAk

1. Good demo of plane/convex/concave mirrors - https://www.youtube.com/watch?v=oDNqfxRYQY0
1a. Another one: https://www.youtube.com/shorts/lWGIMaMe1j4
2. Concave mirror demo using pendulum: https://www.youtube.com/watch?v=3e-LZPHBA2M
3. Concave mirror projecting a real image - https://youtu.be/fyYaDeTonVQ?si=sLBiCK5O9ib1x2Fq&t=117
4. Take a pencil close/away from spoon's inner surface and see when it becomes inverted/magnified?
5. Concave mirror for shaving: https://www.youtube.com/watch?v=m7z60fO3qV8
6. Concave mirror inside torch light: https://www.youtube.com/shorts/o2qaS6FZKSs
7. Concave mirror solar cooker demo: https://www.youtube.com/shorts/rit2cKFuV3Q
7a. Another one: https://www.youtube.com/shorts/WH5fWw1Il0k
Convex mirror - wide field view
1. On bends and turns: https://www.youtube.com/shorts/JAjS9hlpI8g
2. For monitoring, spy cams also use it.

Newton color disc: https://www.youtube.com/shorts/04rVcu21orY
Rainbow with mist and sunlight: https://www.youtube.com/shorts/Z0D_FEmVO-I

Questions:
1. Inside the torch, there is a concave mirror. Where is the lamp placed? At its focal point? Or somewhere else? Why?

Plane mirror ray diagram: