A)
B)
C)
D)
Correct Answer: A
Solution :
[a] If a lens of refractive index m is immersed in a medium of refractive index m1, then its focal length in medium is given by |
If is the focal length of lens in air, then |
If then and have opposite signs and the nature of lens changes i.e. a convex lens diverges the light rays and concave lens converges the light rays. Thus given option [a] is correct. |
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