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A longsighted person has a minimum dista...

A longsighted person has a minimum distance of distinct vision of 50 cm. He wants to reduce it to 25 cm. He should use a

A

concavelens of focal length 50 cm

B

Convex lens of focal length 25 cm

C

Convex lens of focal length 50 cm

D

Convave lens of focal length 25 cm

Text Solution

Verified by Experts

The correct Answer is:
C
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AAKASH SERIES-OPTICAL INSTRUMENTS -PRACTICE SHEET (EXERCISE -I) (OPTICAL INSTRUMENTS) (LEVEL-I (MAIN)) (SUBJECTIVE OBJECTIVE TYPE QUESTIONS)
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  4. The objective lens of a compound microscope produces magnification of ...

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  6. A microscope consists of two convex lenses of focal lengths 2.0 cm and...

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  7. The two lenses of a compound microscope are of focal lengths 2 cm and ...

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  8. The magnifying power of an astronomical telescope for normal adjustmen...

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  13. A converging lens of 2.5cm focal length is used as a simple microscope...

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  17. The focal length of objective and the eyepiece of a compound microscop...

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  18. The magnifying power of an astronomical telescope is 8 and the distanc...

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  19. Focal length of the objective of a terrestrial telescope is 80 cm and,...

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  20. A person cannot see objects clearly beyond 50.cm. The power of lens to...

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