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प्रश्न
State the condition for the following a lens has both its focal lengths equal .
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उत्तर
If a lens has both its focal length equal medium is same on either side of lens.
संबंधित प्रश्न
A student uses a lens of focal length 40 cm and another of –20 cm. Write the nature and power of each lens
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The power of a lens is defined as the:
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