Question

Assertion -A thin lens is more powerful. Reason: - P= 1/f ​

Answer 1

Answer:

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Answer 2

Reason is correct while assertion is incorrect.

• Because of its higher curvature or shorter focal length than a thin lens, a thick convex lens has more power than a thin convex lens.
• The focal length of a thick lens is shorter. We also know that power is equal to focal length times its reciprocal. So, the power increases as the focal length decreases.
• Lens power is expressed as P = 1f, where f is the lens's focal length.
• P=f1, where P is the power in diopters and f is the focal length in metres, represents the power of a lens as the reciprocal of its focal length in metres.
• When two or more narrow lenses are placed closely together, their combined optical power is roughly equal to the total of their individual optical strengths: P = P1 + P2. Similar to this, the combined optical power of all surfaces is about equivalent to the optical power of a single lens. In optometry, these approximations are frequently utilised.

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