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The two spherical surfaces of a double c...

The two spherical surfaces of a double concave lens have the same radius of curvature R, and the refractive index of the medium enclosed by the refracting surfaces is `mu` then the focal length of the lens is

A

`f= (R )/( 2 )`

B

`f = (R )/(2(mu-1))`

C

`f = (R )/(2(1-mu))`

D

`f = (-(mu-1)R)/(2 )`

Text Solution

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The correct Answer is:
C
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MOTION-RAY OPTICS-Exercise-1
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  3. The two spherical surfaces of a double concave lens have the same radi...

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  4. A thin lens is made with as material having refractive index mu=1.5. b...

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  8. IMAGE FORMATION FROM CONCAVE LENS

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  14. If I(1) and I(2) be the size of the images respectively for the two po...

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  15. A convex lens forms a real image on a screen placed at a distance 60 c...

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  16. A plano-convex lens when silvered on the plane side behaves like a con...

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  17. The plane surface of a plano-convex lens of focal length f is silvered...

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