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The image of a candle flame formed by a ...

The image of a candle flame formed by a lens is obtained on a screen placed on the other side of the lens. If the image is three times the size of the flame and the distance between lens and image is 80 cm., at what distance should be candle be placed from the lens? what is the nature of the image at a distance of 80 cm and the lens?

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MODERN PUBLICATION-REFLECTION AND REFRACTION-EXAMPLE
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  15. State Snell's law of refraction of light.

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  16. Why is absolute refractive index always greater than the one.

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