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प्रश्न
Choose the correct option.
Consider the optically denser lenses P, Q, R, and S drawn below. According to the Cartesian sign convention which of these have a positive focal length?
विकल्प
Only P
Only P and Q
Only P and R
Only Q and S
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उत्तर
Only P and Q
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संबंधित प्रश्न
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