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Double-convex lenses are to be manufactu...

Double-convex lenses are to be manufactured from a glass of refractive index 1.55, with both faces of the same radius of curvature. What is the radius of curvature required if the focal length is to be 20cm?

A

102 cm

B

55 cm

C

22 cm

D

51 cm

Text Solution

Verified by Experts

The correct Answer is:
C
22 cm
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KUMAR PRAKASHAN-RAY OPTICS AND OPTICAL INSTRUMENTS-SECTION-D (MULTIPLE CHOICE QUESTIONS (MCQs))(MCQs FROM .DARPAN. BASED ON TEXTBOOK)(MCQs BASED ON TEXTUAL ILLUSTRATION AND EXERCISE)
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  2. A convex lens has 20 cm focal length in air. What is focal length in w...

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  3. A small candle, 2.5 cm in size is placed at 27 cm in front of a concav...

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  4. A 4.5 cm needle is placed 12 cm away from a convex mirror of focal len...

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  5. A tank is filled with water to a height of 12.5 cm. The apparent depth...

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  6. A small bulb is placed at the bottom of a tank containing water to a d...

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  7. Double-convex lenses are to be manufactured from a glass of refractive...

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  8. What is the focal length of a convex lens of focal length 30cm in cont...

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  9. A small telescope has an objective lens of focal length 144cm and an e...

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  10. (a) A giant refracting telescope at an observatory has an objective le...

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  11. (a) A giant refracting telescope at an observatory has an objective le...

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  12. A small pin fixed on a table top is viewed from above from a distance ...

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  13. The image of a small electric bulb fixed on the wall of a room is to b...

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  14. A screen is placed 90cm from an object. The image of the object on the...

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  15. At what angle should a ray of light be incident on the face of a prism...

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  16. A small telescope has an objective lens of focal length 140cm and an e...

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  17. A small telescope has an objective lens of focal length 140cm and an e...

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  18. For the telescope described in Exercise 9.3 (a), what is the separatio...

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  19. If this telescope is used to view a 100 m tall tower 3 km away, what i...

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  20. (a) For the telescope described in Exercise 9.28 (a), what is the sepa...

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