You are standing in front of a lens that projects an image of you onto a wall 3.

Question

You are standing in front of a lens that projects an image of you onto a wall 3.00m on the other side of the lens. This image is three times your height.

Part A

How far are you from the lens?

SubmitMy AnswersGive Up

Part C

What is the focal length of the lens?

You are standing in front of a lens that projects an image of you onto a wall 3.00m on the other side of the lens. This image is three times your height.

Part A

How far are you from the lens?

SubmitMy AnswersGive Up

Part C

What is the focal length of the lens?

Explanation / Answer

Solution )

hi/ho = -v/u

3h/h = -3/u

u = -1m

Therefore I am 1 m from the lens.

b) 1/f = 1/u + 1/v

1/f = 1/1 + 1/3

1/f = 1+1/3 =4/3

f= 3/4

Therefore focal length = 0.75m

Related Questions

Navigate

• Browse (All)
• Browse Y
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.