The diagrams show the appearance of a fork when placed in front of and close to two mirrors A and B, turn by turn.
Which mirror is convex.
Which mirror is concave.
Give reasons for your choice.
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Mirror B is convex, as it forms a small image.
Mirror A is concave, as it forms a large image.
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The speed of light in water is $2.25 \times 10^8 m / s$. If the speed of light in vacuum be $3 \times 10^8 m / s$, calculate the refractive index of water.
You are provided with two lenses of focal lengths 10cm and 20cm. Which of the two lenses would you suggest to obtain greater convergence on refracted light? Justify your choice.