Question

.QUESTION.

You have three lenses L1, L2 and L3 of powers +10D, +5D and -10D respectively.

a) State the nature and focal length of each lens.

b) Explain which of the three lenses will form a virtual and magnified image of an object placed at 15 cm from the lens.

Answer 1

Answer:

a) lens having +10D power will have focal length 10cm and it is convex lens (nature).

lens having +5D power will have focal length 20cm and it is convex lens (nature).

lens having - 10D power will have focal length -10cm and it is a concave lens (nature).

formula for finding focal length:

f = 100/P

b) L2 will make a virtual and magnified image because it make virtual and magnified image only when the object is kept between focal point and the optical center.

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