InterviewSolution
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InterviewSolution
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Fill in the blanks and rewrite the statements:i. The focal length of a lens with power 2.5 D is………..ii. The power of a lens with focal length 20 cm is………..iii. The minimum distance of distinct vision for a normal human eye is………..iv. If two lenses with focal lengths 10 cm and 20 cm respectively are kept in contact with each other, the effective power of the combination is………..v. A………..lens is used as a simple microscope. |
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Answer» i. The focal length of a lens with power 2.5 D is 40 cm (0.4 m). ii. The power of a lens with focal length 20 cm is 5D. iii. The minimum distance of distinct vision for a normal human eye is 25 cm. iv. If two lenses with focal lengths 10 cm and 20 cm respectively are kept in contact with each other, the effective power of the combination is 15 D. v. A convex lens is used as a simple microscope. |
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