Thin Lens And Lens Maker Equations Video Lessons

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Problem: Oscar has an old-fashioned lantern projector that uses a candle and a lens to project a slide onto the wall. The lens is 1.2 cm from the slide and projects an image onto a screen 80 cm away. Oscar adds a lens to the original lens to allow him to project an image onto a screen 30 cm away.What is the power of the original lens?

FREE Expert Solution

Lens maker equation:
1so+1si=1f

Power of a lens:

D=1f

For the first lens:

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Problem Details

Oscar has an old-fashioned lantern projector that uses a candle and a lens to project a slide onto the wall. The lens is 1.2 cm from the slide and projects an image onto a screen 80 cm away. Oscar adds a lens to the original lens to allow him to project an image onto a screen 30 cm away.

What is the power of the original lens?

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