Describe with the help of a ray-diagram, the size, nature and position of the image formed by a convex lens when an object is placed beyond 2f in front of the lens.

Draw ray diagrams showing the image formation by a convex lens when an object is placed:At twice the focal length of the lens.

Draw a ray diagram to show the path of the reflected ray corresponding to an incident ray which is directed parallel to the principal axis of a convex mirror. Mark on it the angle of incident and the angle of reflection.

The diagram given alongside shows a ray of light entering a rectangular block of glass:

1. Copy the diagram and draw the normal at the point of entry.
2. Draw the approximate path of the ray of light through the glass block and out of the other side.

If two lenses (convex) are in contact with each other, what happens to the ray after refraction?

When a light ray passes from air into glass, what happens to its speed? Draw a diagram to show which way the ray of light bends.

“The magnification produced by a spherical mirror is - 3”. List four informations you obtain from this statement about the mirror/ image.

Why does a ray of light passing through the centre of curvature of a concave mirror gets reflected along same path after reflection?

State and define the SI unit of power of a lens.

The letter F is placed in front of a plane mirror:

1. How would its image look like when seen in a plane mirror?
2. What is the name of the phenomenon involved?