Prelab Prelab for Lenses Questions Due at the Beginning of Lab You decide to go
ID: 2038825 • Letter: P
Question
Prelab Prelab for Lenses Questions Due at the Beginning of Lab You decide to go outside and help your nephew fry some ants with a magnifying glass. You show him Name that when you hold the magnifying glass at just the right distance from the ants, they cook faster You decide that this is the perfect time to teach him some physics 1. Why is there a certain distance you must hold the magnifying glass at to cook the ants? magK 2. If you place the magnifying glass at half the distance needed to cook an ant, how big would the image of the ant be? to cook the art ,t has t?he placedat t-e focu? ??? 2- distacee tewgth of the lens, so tle inoge ferns it is a virtual imageExplanation / Answer
1. We need a certain distance to fry because we need to place the ant on the focal point of the lens so that all the intensity of sunlight can be converges at a single point. Hence it cause burn.
2. U= - f/2
Using lens formula,
1/f= 1/V+ (-1)/(f/2)
V= -f
Image is virtual and formed at negative focus.
Comment in case doubt..goodluck