what is meant by the power of a lens? you have three 3 lens L 1, L 2, L 3 of powers +10D, +5D, -10D respectively. state the nature and the focal length of each lens. explain which of three lens will form a virtual and magnified image of an object placed at 15 cm from the lens. draw a ray diagram in support of your answer.
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Answer: have a look at the picture:
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