Question

A 7.5 cm object is 14 cm from a concave lens, which has a focal length of –7 cm. What is the distance of the image from the lens? Round your answer to the nearest whole number. 5 cm –5 cm 14 cm –14 cm

Answer 1

-5 cm

Step-by-step explanation:

Just took it : )

Answer 2

-5 cm

Step-by-step explanation:

We can use the lens equation:

`(1)/(f)=(1)/(p)+(1)/(q)`

where

f = -7 cm is the focal lenght

p = 14 cm is the distance of the object from the lens

q is the distance of the image from the lens

Solving the equation for q, we find

`(1)/(q)=(1)/(f)-(1)/(p)=(1)/(-7 cm)-(1)/(14 cm)=-(3)/(14 cm)\\q=(-14 cm)/(3)=-4.67 cm \sim -5 cm`