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A concave mirror has radius of curvature of 40 cm. It is at the bottom of a glass that has water filled up to 5 cm (see figure). If a small particle is floating on the surface of water, its image as seen, from directly above the glass, is at a distance d from the surface of water. The value of d is dose to: (Refractive index of water = 1.33) 5 cm Particle

1. 11.7 cm
2. 6.7 cm
3. 13.4 cm
4. 8.8 cm

Correct answer: 8.8 cm

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