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How for must a girl standing front of a concave spherical mirror of radius 120 cm to see an erect image of her face four times its natural size?

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Light or visible light is electromagnetic radiation that can be perceived by the human eye. Visible light is usually defined as having wavelengths in the range of 400–700 nanometres, corresponding to frequencies of 750–420 terahertz, between the infrared and the ultraviolet.


How for must a girl standing front of a concave spherical mirror of radius 120 cm to see an erect image of her face four times its natural size?






 
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