Question

4. When an object is placed at 15 cm from an optical lens it produces an...

4. When an object is placed at 15 cm from an optical lens it produces an image at -60 cm.

a) What is the focal length of the lens?

b) If the image height is 5.00 cm, what is the height of the object?

c) What type of lens is this and why?

d) Is the image upright or inverted compared to the object?

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Answer #1

Focal length f is positive lens is convex

Focal length f negative lens is concave

Height of image is positive image is erect or upright

Height of image is negative image is inverted

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