You are a scout doing a merit badge on fire starting and have a magnifying glass with a focal length 9.2 cm. The Sun is 150 million km away. How close to the tinder (fire starter) should you hold the magnifying glass to have the best chance of starting a fire? (You want to concentrate the sunlight).

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You are a scout doing a merit badge on fire starting and have a magnifying
glass with a focal length 9.2 cm.
The Sun is 150 million km away. How close to the tinder (fire starter) should
you hold the magnifying glass to have the best chance of starting a fire? (You
want to concentrate the sunlight).
Select one:
a. 0 cm, place the lens right on the tinder
Ob. 9.20 cm
Oc. 4.60 cm
Od. any distance will work
Transcribed Image Text:You are a scout doing a merit badge on fire starting and have a magnifying glass with a focal length 9.2 cm. The Sun is 150 million km away. How close to the tinder (fire starter) should you hold the magnifying glass to have the best chance of starting a fire? (You want to concentrate the sunlight). Select one: a. 0 cm, place the lens right on the tinder Ob. 9.20 cm Oc. 4.60 cm Od. any distance will work
You're a California scout in fire season and actually don't want to risk starting
a fire. Your magnifying glass has focal length 9.2 cm.
Of the choices below which distance from the lens to your fire starter would
be certain not to start a fire?
Select one:
а. 10.20
O b. 8.2
Ос. 11.20
Transcribed Image Text:You're a California scout in fire season and actually don't want to risk starting a fire. Your magnifying glass has focal length 9.2 cm. Of the choices below which distance from the lens to your fire starter would be certain not to start a fire? Select one: а. 10.20 O b. 8.2 Ос. 11.20
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