Question

A doctor’s prescription has a corrective lens of power -3.5 D. Find the focal length of the lens.
What is the type of the prescribed lens?
A. 30cm, convex lens
B. 30cm, concave lens
C. 28 cm, convex lens
D. 28cm, concave lens

Answer 1

Answer:

option d

Explanation:

• Power= 1 / focal length ( in metres)
• Thus , focal length = - 100/ 3.5 (cm)
• f= -28cm

Also, the negative sign indicates that it is a diverging or concave lens.

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Answer 2

Answer:

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D. 28cm, concave lens

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