Question
How can we distinguish between concave and convex mirrors?
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| S.No. | Year | Shortage (%) |
| $1$ | $1991$ | $7.9$ |
| $2$ | $1992$ | $7.8$ |
| $3$ | $1993$ | $8.3$ |
| $4$ | $1994$ | $7.4$ |
| $5$ | $1995$ | $7.1$ |
| $6$ | $1996$ | $9.2$ |
| $7$ | $1997$ | $11.5$ |