Discuss the case when a convex lens forms a virtual and enlarged image.
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When the object is placed between optical centre and the focus of the convex lens a virtual and enlarged image is formed.
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In an experiment with a rectangular glass slab, a student observed that a ray of light incident at an angle of $55^{\circ}$ with the normal on one face of the slab, after refraction strikes the opposite face of the slab before emerging out into air making an angle of $40^{\circ}$ with the normal. Draw a labelled diagram to show the path of this ray.' What value would you assign to the angle of refraction and angle of emergence?
Write down the magnification formula for a lens in terms of object distance and image distance. How does this magnification formula for a lens differ from the corresponding formula for a mirror?
Draw a ray diagram to show the formation of a real diminished image of an object by a convex lens. In your diagram, the position of object and image with respect to the principal focus should be shown clearly.
Redraw the following diagram on your answer sheet and show the path of the reflected ray. Also mark the angle of incidence $(\angle\text{i})$ and the angle of reflection $(\angle\text{r})$ on the diagram.