A 2 meter long scale with least count of 0.2 cm is used to measure the locations of objects on an optical benc…

Question

A **$$2 \, 	ext{meter}$$** long scale with least count of **$$0.2 \, 	ext{cm}$$** is used to measure the locations of objects on an optical bench. While measuring the focal length of a convex lens, the object pin and the convex lens are placed at **$$80 \, 	ext{cm}$$** mark and **$$1 \, 	ext{m}$$** mark, respectively. The image of the object pin on the other side of lens coincides with image pin that is kept at **$$180 \, 	ext{cm}$$** mark. The % error in the estimation of focal length is:

Accepted Answer

D. $$1.70$$

Answer

A. $$0.51$$

Answer

B. $$1.02$$

Answer

C. $$0.85$$

Answer & step-by-step solution

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