Recent content by radiofruit

Thanks! So glad I join this message board. My physics 11 teacher is horrendous, our class average is in the 50's. I'm managing a 'B', but it's been difficult.

Gahh! that's why it didn't work. I forgot to convert Units. Ahhh I'm a silly physics 11 student. Thanks for your help! Hmm does the distance from the retina to the lense (20 mm ) count as the Do ?

Mirror equation help! please urgent! Homework Statement The distance from the lens of someone's eye to the retina is 20.0 mm. if the image of a book held 40.0 cm is in front of the eye in sharp focus, what is the effective focal length of the lense. the back of the book says the answer is...