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

A

`frac(R)(2(mu_1 + mu_2))`

B

`frac(R)(2(mu_1 - mu_2))`

C

`frac(R)(mu_1 - mu_2)`

D

`frac(2R)(u_2 - u_1)`

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TARGET PUBLICATION-OPTICS-EXERCISE
  1. Two similar thin equiconvex lenses, of focal length f each, are kept c...

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  2. Two identical thin plano-convex glass lenses (refractive index 1.5) ea...

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  3. A plnao=convex lens fits exactly into a plano-concave lens. Their plan...

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  4. A plano-convex lens fits exactly into plano-concave lens as shown in t...

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  5. A comvex lens and a concave lens are placed in contact. The ratio of m...

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  6. Two identical glass (mu(w)=3//2) equiconvex lenses of focal length f e...

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  7. Two identical equiconvex lenses, each of focal length 'f' are placed s...

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  8. A bi-convex lens is formed with two thin plano convex lenses as shown ...

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  9. Two convex lenses of focal lengths f(1)andf(2) are separated co-axiall...

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  10. A diverging lens with magnitude of focal length 25 cm is placed at a d...

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  11. Assertion: There is no dispersion of light refracted through a rectang...

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  12. The graph between angle of deviation (delta) and angle of incidence (i...

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  13. Two beams of red and violet colours are made to pass separately throug...

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  14. A ray is incident at an angle of incidence i on one surface of a small...

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  15. A ray of light is incident at an angle of 60^(@) on the face of a pris...

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  16. In an experiment for determination of refractive index of glass of a p...

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

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  18. Angle of minimum deviation for a prism of refactive index 1.5, is equa...

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  19. A ray of light suffers a minimum deviation when incident on an equilat...

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  20. For an angle of incidence theta on an equilateral prism of refractive ...

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