Answer to Question #156520 in Physics for Sandra

Question

This question concerns the images formed by lenses.

a) Make a scale drawing to show how an image is formed by a diverging lens. The lens has a focal length of 10 cm, and the object is 5 cm from the centre of the lens. The object is 2 cm tall. Hint: the ray diagram will be much easier to draw if you use squared paper. (4 marks)

b) Is the image real or virtual? Give a reason for your answer (2 marks)

c) Use the lens formula, with the sign convention ‘real is positive’ and the given object distance and focal length to confirm that this image is in the correct place (2 marks)

d) Calculate the magnification, and compare it to the magnification measured from your drawing (2 marks)

e) What is the power of this lens? (2 marks)

f) If you add a second lens to this, with a power of + 10 dioptres, what is the total power? (2 marks)

Answer 1

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