Question

Q 16.
The power of a concave lens of focal
length has each a focal length of -15 CM.
The mirror and the lens are likely to be-
1. both concave
2. both convex
3. the mirror is concave and the lens is convex
4. the mirror is convex ,but the lens is concave​

Answer 1

Answer:

Answer: (A) both concave

For converging lenses, the focal length is always positive, while diverging lenses always have negative focal lengths. Here the answer is both concave. Both the concave mirror and concave lens have a negative focal length

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Answer 2

Answer:

Answer: (A) both concave

For converging lenses, the focal length is always positive, while diverging lenses always have negative focal lengths. Here the answer is both concave. Both the concave mirror and concave lens have a negative focal length.