1) which of the following is a true statement? (A) The power of a lens is always positive (B) The power of lens is always negative (C) The power of convex lens is positive (D) The power of a concave lens is positive
Answers
Answer:
C.The power of convex lens is positive
Explanation:
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Answer:
(C) The power of convex lens is positive.
Explanation:
Explanation for correct option:
Explanation for correct option:
(C) The power of convex lens is positive.
Various quantities define the property of a lens or its working, like focal length, object distance, and image distance. Considering the normal cartesian sign convention, the focal length of the convex lens is positive as its first globular face will have a focus on the right-hand side of the pole. The power of the lens is defined as the complementary of the focal length of the lens. For convex lens, focal length is positive so, power will also be positive.
Explanation for incorrect options:
(A) The power of a lens is always positive.
The power of a lens is the measure of its capability to meet or diverge a resemblant ray of light on refraction through it. Hence, negative sign is for concave lens and positive sign is for convex lens. The S.I. unit of power is dioptre(D).
(B) The power of lens is always negative.
The power of a lens is always positive.
The power of a lens is the measure of its capability to meet or diverge a resemblant ray of light on refraction through it. Hence, negative sign is for concave lens and positive sign is for convex lens. The S.I. unit of power is dioptre(D).
(D) The power of a concave lens is positive.
Power in optics is the capacity of the optic instrument to bend the light shafts striking it. Power is defined as positive if an outfit bends the light shafts in the direction of the optic axis. A concave lens will always have a negative focal length because it's a diverging lens. The shafts incident on a concave lens diverges. It's also appertained to as a diverging lens because of this. Hence, a concave lens is negative.
Therefore, option (C) is correct.
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