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A plano-convex lens fits exactly into a plano-concave lens. Their plane surfaces are parallel to each other. If the lenses are made of different material of refractive indices `mu_(1)` and `mu_(2)` and R is the radius of curvature of the curved surface of the lenses, then focal length of the combination is

A

`R/(2(mu_(1)-mu_(2)))`

B

`R/(mu_(1)-mu_(2))`

C

`(2R)/(mu_(2)-mu_(1))`

D

`R/(2(mu_(1)+mu_(2)))`

Text Solution

Verified by Experts

The correct Answer is:
2
`1/f = 1/f_(1) + 1/f_(2)`
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NARAYNA-RAY OPTICS AND OPTICAL INSTRAUMENTS -EXERCISE- 3
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  2. The critical angle for total internal reflection in diamond is 24.5^(@...

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  3. When a glass lens with mu = 1.47 is immersed in a trough of liquid, it...

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  4. A convex lens of refractive index 3/2 has a power of 2.5^(@). If it is...

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  5. The position of an object placed 5 cm in front of concave mirror of ra...

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  6. The speed of light in media M1 and M2 are 1.5 xx 10^8 m//s and 2.0 xx ...

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  7. A ray of light is incident on a 60^(@) prism at the minimum deviation ...

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  8. A lens haivng focal length and aperture of diameter d forms an image o...

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  9. A Galilean telescope has objective and eye- piece of focal lengths 200...

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  10. A far sighted person has his near point 50 cm. Find the power of lens ...

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  11. A plano-convex lens fits exactly into a plano-concave lens. Their plan...

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  12. For a normal eye, the cornea of eye provides a converging power of 40 ...

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  13. If the focal length of the objective lens is increased then

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  14. The angle of a prism is A . One of its refracting surfaces is silvered...

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  15. In an astronomical telescope in normal adjustment a straight black lin...

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  16. A beam of light consisting of red, green and blue colours is incident ...

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  17. Two identical thin planoconvex glass lenses (refractive index 1.5) eac...

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  18. The refracting angle of a prism is A and refractive index of the mater...

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  19. The angle of incidence for a ray of light at a refracting surface of a...

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  20. An astronomical telesope has objective and eyepiece of focal lengths 4...

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