A lens maker desires to make a lens of focal length 30 cm, Physics

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A lens maker desires to make a lens of focal length 30 cm

A Lens maker desires to make a lens of focal length 30 cm. in air. The equipment in the shop is set to make lens faces of 20 cm.

1. What would the focal length of this lens be in water (n=4/3)?

2. What index of refraction must the lens material have to produce this focal length?

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Physics: A lens maker desires to make a lens of focal length 30 cm

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Physics: A lens maker desires to make a lens of focal length 30 cm

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