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

List four properties of the image formed by a plane mirror.

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.

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

Why does a beam of light when it enters glass at an angle? Why does it not bend if it inters the glass at right angles?

Identify the device used as a spherical mirror or lens in following cases, when the image formed is virtual and erect in each case.
Object is placed between device and its focus, image formed is enlarged and behind it.

An object of height 2.5 cm is placed at a distance of 15 cm from the optical centre ‘O' of a convex lens of focal length 10 cm. Draw a ray diagram to find the position and size of the image formed. Mark optical centre ‘O', principal focus F and height of the image on the diagram.

What do you understand by the power of a lens? Name one factor on which the power of a lens depends.

Draw and complete the following diagrams to show what happens to the beams of light as they enter the glass block and then leave it:

Show the lateral displacement of the ray on the diagram.