The focal length of a lens depends upon a.nature of material b.colour of light C. medium in which lens is placed
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Answer:
a. Nature of material
Step-by-step explanation:
coz the lens can be concave and convex
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The focal length of a lens is depended on the nature of material as well as surrounding medium. The reason behind this phenomenon is that the angle of refraction of a lens is depended on the indices of refraction of the medium oflens and the incomingmedium and the difference in their
indices
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