The sun is 150,000,000 km from earth; its diameter is 1,400,000 km. a student uses a 5.2-cm-diameter lens with f = 10 cm to cast an image of the sun on a piece of paper. where should the paper be placed relative to the lens to get a sharp image?

The paper is placed on the focus of the lens then we get the sharp image.

Explanation:

Given that,

Object distance = 150000000 km

Diameter = 1400000 km

Diameter of lens = 5.2 cm

Focal length = 10 cm

We need to calculate the image distance

Using formula of lens

Here,

Hence, The paper is placed on the focus of the lens then we get the sharp image.

i was thinking more like reflects green light, just not sure