Easy
The velocity of light in a vacuum is $....$
- A$3 \times 10^{5} \text{ m s}^{-1}$
- B$3 \times 10^{6} \text{ m s}^{-1}$
- C$3 \times 10^{8} \text{ m s}^{-1}$
- D$3 \times 10^{7} \text{ km s}^{-1}$
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$(a)$ Calculate the distance at which an object should be placed in front of a convex lens of focal length $10\, cm$ to obtain a virtual image of double its size.
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