A convex lens of focal length 10 cm has a power of +0.1 D.

True

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False

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Solution

The correct option is B False

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Q. What is the power of a convex lens of focal length 10 cm?

A convex lens has a focal length of 10cm. What is the power of the lens?

Q. A combination of convex and concave lenses has power

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Question 8
Which of the following statements is true?
(a) A convex lens has 4 dioptre power having a focal length 0.25 m.
(b) A convex lens has -4 dioptre power having a focal length -0.25 m.
(c) A concave lens has 4 dioptre power having a focal length 0.25 m.
(d) A concave lens has 4 dioptre power having a focal length -0.25 m.

The lens of power + 1.0 D is :

(a) convex of focal length 1.0 cm

(b) convex of focal length 1.0 m

(d) concave of focal length 1.0 m

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