State and explain the laws of refraction of light with the help of a labelled diagram.

State any four characteristics of the image of an object formed by a plane mirror.

Write the formula for a lens connecting image distance (υ), object distance (u) and the focal length (f). How does the lens formula differ from the mirror formula?

If a ray of light enters from alcohol to air. The refractive index of alcohol is 1.36. Calculate the speed of light in alcohol with respect to air.

It is desired to obtain an erect image of an object, using concave mirror of focal length of 12cm.
Will the image be smaller or larger than the object? Draw ray diagram to show the formation of image in this case.

Which lens would you prefer to use while reading small letters from a dictionary?

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

What are the important differences between looking at a photograph of your face and looking at yourself in a plane mirror?

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

List some things that convex lens and concave mirror have in common.